MyMedR

Flow and heat transfer of a power-law fluid over a permeable shrinking sheet

Nor Azizah Yacob, Anuar Ishak

Sains Malaysiana, 2014;43:491-496.

The steady, two-dimensional laminar flow of a power-law fluid over a permeable shrinking sheet of constant surface temperature is investigated. The governing partial differential equations were transformed into a system of nonlinear ordinary differential equations using a similarity transformation, before being solved numerically by the Runge-Kutta- Fehlberg method with shooting technique. The results are presented graphically and the effects of the power-law index n, suction parameter fw and Prandtl number Pr were discussed. It was found that stronger suction is necessary for the solution to exist for a pseudoplastic fluid (n<1) compared to a dilatant fluid (n>1).

Matched MeSH terms: Suction

Fulltext Two new species of Urothoe (Crustacea, Amphipoda, Gammaridea) from the East Johor Islands Archipelago, Malaysia

Azman BA, Melvin CW

Zookeys, 2011.

PMID: 21594101 DOI: 10.3897/zookeys.87.817

Two new species of urothoid amphipods from Pulau Sibu and Pulau Tinggi, Johor are described and illustrated. The specimens of Urothoe sibuensis new species were collected by vertical haul plankton net and is distinctively different from other existing Urothoe species by these combination of special characters; similar gnathopods 1-2 with short and stout propodus expanded into poorly defined palms; large eyes and epimeron 3 smooth. Urothoe tinggiensis new species as collected using an airlift suction sampler at seagrass area is characterized by its different gnathopodal configuration with setose dactylus of 5th pereopod; eyes minute; carpus is wider than merus in the 5th pereopod; subquadrate coxa 4; merus and carpus of pereopods 6-7 are linear.

Matched MeSH terms: Suction

Fulltext Non-alignment stagnation-point flow of a nanofluid past a permeable stretching/shrinking sheet: Buongiorno's model

Hamid RA, Nazar R, Pop I

Sci Rep, 2015;5:14640.

PMID: 26440761 DOI: 10.1038/srep14640

The paper deals with a stagnation-point boundary layer flow towards a permeable stretching/shrinking sheet in a nanofluid where the flow and the sheet are not aligned. We used the Buongiorno model that is based on the Brownian diffusion and thermophoresis to describe the nanofluid in this problem. The main purpose of the present paper is to examine whether the non-alignment function has the effect on the problem considered when the fluid suction and injection are imposed. It is interesting to note that the non-alignment function can ruin the symmetry of the flows and prominent in the shrinking sheet. The fluid suction will reduce the impact of the non-alignment function of the stagnation flow and the stretching/shrinking sheet but at the same time increasing the velocity profiles and the shear stress at the surface. Furthermore, the effects of the pertinent parameters such as the Brownian motion, thermophoresis, Lewis number and the suction/injection on the flow and heat transfer characteristics are also taken into consideration. The numerical results are shown in the tables and the figures. It is worth mentioning that dual solutions are found to exist for the shrinking sheet.

Matched MeSH terms: Suction

Ingham problem for mixed convection flow of a nanofluid over a moving vertical plate with suction and injection effects

Anuar Jamaludin, Roslinda Nazar, Ioan Pop

Sains Malaysiana, 2018;47:2213-2221.

In this study, the effects of suction and injection on the mixed convection flow of a nanofluid, over a moving permeable
vertical plate were discussed. A similarity variable was used to transform the governing equations to the ordinary
differential equations, which were then solved numerically using the bvp4c programme from MATLAB. Dual solutions
(upper and lower branches) were found within a certain range of the mixed convection parameter in assisting and
opposing flow regions. A stability analysis was implemented to confirm that the upper branch solution was stable, while
the lower branch solution was unstable.

Matched MeSH terms: Suction

Fulltext On solution existence of MHD Casson nanofluid transportation across an extending cylinder through porous media and evaluation of priori bounds

Abdal S, Hussain S, Siddique I, Ahmadian A, Ferrara M

Sci Rep, 2021 Apr 08;11(1):7799.

PMID: 33833251 DOI: 10.1038/s41598-021-86953-1

It is a theoretical exportation for mass transpiration and thermal transportation of Casson nanofluid over an extending cylindrical surface. The Stagnation point flow through porous matrix is influenced by magnetic field of uniform strength. Appropriate similarity functions are availed to yield the transmuted system of leading differential equations. Existence for the solution of momentum equation is proved for various values of Casson parameter [Formula: see text], magnetic parameter M, porosity parameter [Formula: see text] and Reynolds number Re in two situations of mass transpiration (suction/injuction). The core interest for this study aroused to address some analytical aspects. Therefore, existence of solution is proved and uniqueness of this results is discussed with evaluation of bounds for existence of solution. Results for skin friction factor are established to attain accuracy for large injection values. Thermal and concentration profiles are delineated numerically by applying Runge-Kutta method and shooting technique. The flow speed retards against M, [Formula: see text] and [Formula: see text] for both situations of mass injection and suction. The thermal boundary layer improves with Brownian and thermopherotic diffusions.

Matched MeSH terms: Suction

Collapsibility and volume change behavior of unsaturated residual soil

Huat, Bujang B.K, Faisal AIi, Choong, Foong Heng

Pertanika Journal of Science & Technology, 2007;15(2):85-94.

MyJurnal

Residual soils occur in most countries of the world but the greater areas and depths are normally found in tropical humid areas. In these places, the soil forming processes are still very active and the weathering is much faster than the erosive factor. Most residual exhibit high soil suctions for most of the year. The absence of positive pore water pressure except immediately after rain, renders conventional soil mechanics for saturated soil irrelevant. In particular, the effective stress theories of saturated soil are not applicable at the practical leve l. Ignorance or lack of understanding of the geotechnical behavior of soil in the partially or unsaturated state has caused a lot of damages to infrastructures, buildings and other structures. For instances, the collapsibility and volume change of partially saturated soils in connection with the drying or wetting causes a lot of damage to foundation, roads and other structures. As such, the development of extended soil mechanics, which embraces the soil in the unsaturated state or subjected to soil suction, is essential. This paper examines the collapsibility and volume change behavior specifically of an unsaturated residual soil under various levels of applied matric suction (u -u ), and net mean stress (a-u) in a predetermined stress path. The volume change of ;he"' soil is found to be sensitive to both the applied matric suction and net mean stress. The soil is found to exhibit a collapsibility behavior upon a reduction in applied matric suction to 25 kPa at constant net mean stress.

Matched MeSH terms: Suction

Indigenous Malay surgery

Chen PCY

Trop Geogr Med, 1973 Mar;25(1):95-9.

PMID: 4694004

Three indigenous Malay surgical procedures, namely circumcision by the mudim, bone-setting by the bomoh patah and cupping, are described. It is noted that complications are associated with both circumcision and bone-setting, and suggestions are made of possible health measures to cope with the situation.

Matched MeSH terms: Suction

MHD stagnation point flow with suction towards a shrinking sheet

Lok YY, Anuar Ishak, Pop I

Sains Malaysiana, 2011;40:1179-1186.

A steady two-dimensional magnetohydrodynamic (MHD) stagnation-point flow of a viscous and electrically conducting fluid over a permeable shrinking sheet has been studied. The governing partial differential equations are reduced to the nonlinear ordinary differential equations by a similarity transformation. The resulting differential equations are then solved numerically using an implicit finite difference method. It is found that the solutions are non-unique for weak magnetic field, strong suction and large velocity ratio between free stream velocity and wall shrinking velocity.

Matched MeSH terms: Suction

MHD flow and heat transfer adjacent to a permeable shrinking sheet embedded in a porous medium

Noor Fadiya Mohd Noor, Ishak Hashim

Sains Malaysiana, 2009;38.

The magnetohydrodynamic (MHD) boundary-layer flow and heat transfer due to a shrinking sheet in a porous medium is considered for the first time. The Navier-Stokes equations and the heat equation are reduced to two nonlinear ordinary differential equations via similarity transformations. The transformed equations are solved by a semi-analytic method. The effects of the suction and porosity parameters, the Prandtl and Hartmann numbers on the skin friction, heat transfer rate, velocity and temperature profiles are discussed and presented, respectively.

Matched MeSH terms: Suction

Fulltext Suction elevator for ear surgery

Raman R, Omar R

Indian J Otolaryngol Head Neck Surg, 2011 Jul;63(3):302.

PMID: 22754818 DOI: 10.1007/s12070-011-0155-4

An instrument has been designed to combine a suction and an elevator for use in ear surgery.

Matched MeSH terms: Suction

J-shaped catheter for endobronchial aspiration of right upper lobe bronchus during rigid bronchoscopy in pediatric patients

Majid AA

Chest, 1991 Sep;100(3):862.

PMID: 1889289

A J-shaped suction catheter was tailored to facilitate aspiration of the right upper lobe bronchus during rigid bronchoscopy in pediatric patients. This suction catheter was used successfully in three patients.

Matched MeSH terms: Suction/instrumentation*

Fulltext Recurrent re-expansion pulmonary oedema complicating rapid decompression of large pneumothoraces

Liam CK, Jaafar S

Med J Malaysia, 1991 Jun;46(2):199-202.

PMID: 1839427

A young male who developed ipsilateral pulmonary oedema on two occasions as a complication of treatment of pneumothoraces involving the left lung is reported. The importance of large pneumothoraces, the rapidity of decompression and the application of suction to the pleural space as factors predisposing to the development of re-expansion pulmonary oedema is well demonstrated by this case. The re-expansion pulmonary oedema was more severe on the second occasion when the lung had collapsed for a longer duration compared to the first pneumothorax which was of more recent onset.

Matched MeSH terms: Suction/adverse effects

New progress in the study of intergranular suction and shear strength of unsaturated soil

Liansheng Tang, Haitao Sang, Liqun Jiang, Yinlei Sun

Sains Malaysiana, 2016;45:141-156.

The suction between soil particles is the basis and core problem in the study of unsaturated soil. However, is the suction between soil particles just the matrix suction (which has been widely used since the discipline of unsaturated soil mechanics was established). In fact, the concept of matrix suction is from soil science and reflects the water-absorbing capacity of the soil. Matrix suction characterizes the interaction between soil particles and pore water rather than the interactions between soil particles, which were not in conformity with the principle of effective stress of soils. The suction of unsaturated soil, in essence, is the intergranular suction composed of absorbed suction and structural suction. In this paper, first, the basic concepts of absorbed suction and structural suction were briefly introduced. Then, with soil mechanics, powder science, crystal chemistry, granular material mechanics and other related disciplines of knowledge for reference, the quantitative calculation formulas were theoretically deduced for the absorbed suction for equal-sized and unequal-sized unsaturated soil particles with arbitrary packing and the variable structural suction for equal-sized unsaturated soil particles with arbitrary packing and unequal-sized unsaturated soil particles with close tetrahedral packing. The factors that influence these equations were discussed. Then, the shear strength theory of unsaturated soil was established based on the theory of intergranular suction through the analysis of the effective stress principle of unsaturated soil. This study demonstrates that the shear strength of unsaturated soil consists of three parts: The effective cohesive force, the additional strength caused by external loads and the strength caused by intergranular suction. The contribution of the three parts to the shear strength of unsaturated soil depends on the following influence factors: Soil type, confining pressure, water content and density. Therefore, these factors must be comprehensively considered when determining the strength of an unsaturated soil.

Matched MeSH terms: Suction

Investigation of heat mass transfer for combined convective slips flow: a lie group analysis

Md. Jashim Uddin, Md. Ismail A, Hamad M

Sains Malaysiana, 2012;41:1139-1148.

The steady laminar combined convective flow with heat and mass transfer of a Newtonian viscous incompressible fluid over a permeable flat plate with linear hydrodynamic and thermal slips has been investigated numerically. The velocity of the external flow, the suction/injection velocity and the temperature of the plate surface are assumed to vary nonlinearly following the power law with the distance along the plate from the origin. Lie group analysis is used to develop the similarity transformations and the governing momentum, the energy conservation and the mass conservation equations are converted to a system of coupled nonlinear ordinary differential equations with the associated boundary conditions. The resulting equations are solved numerically using the Runge-Kutta-Fehlberg fourth-fifth order numerical method. The effects of hydrodynamic slip parameter (a), thermal slip parameter (b), suction/injection parameter (fw), power law parameter (m), buoyancy ratio parameter (N), Prandtl number (Pr) and Schmidt number (Sc) on the fluid flow, heat transfer and mass transfer characteristics are investigated and presented graphically. We have also shown the effects of the Reynolds number (Re) and the power law parameter (m) on the velocity slip and the thermal slip factors. Good agreement is found between the numerical results of the present paper and published results.

Matched MeSH terms: Suction

Rainfall infiltration through unsaturated layered soil column

Aniza Ibrahim, Muhammad Mukhlisin, Othman Jaafar

Sains Malaysiana, 2014;43:1477-1484.

Infiltration caused by rainfall will lead to the changes of moisture content and soil pore water pressure or matric suction of the soil. These changes indicate the behavior of the soil especially during wetting and drying process. This paper presents the experimental test result of rain water infiltration into soil column for two samples of soils. The main objectives were to study the effect of rainfall intensity and duration of soil infiltration process for the forest soil and to compare its result to the gravelly sand. Infiltration experimental in this study involved three main components; water supply system, soil column and instrumentations, including percolation collection system. This study uses two types of tensiometers; 5 and 10 cm long. The results of TDR and tensiometers which were used to obtained moisture content and matric suction, respectively, shows that the system was successfully developed. For the forest soil, the result showed that moisture content of the top section is higher compared with the other sections. On the other hand, for gravelly sand, the moisture content in middle section is higher compared with the top and bottom section of the soil. Meanwhile, matric suction for both soils dropped during rainfall and gradually increases towards drying process. Other than that the comparison of soil matric suction between 5 and 10 cm tensiometers shows significant results for gravelly sand compared to forest soil.

Matched MeSH terms: Suction

Evaluation of a Novel Field Suction Unit (SÜPEVAC): A Mannequin Crossover Trial

Baxter T, Grimmett W, Reardon D

Air Med J, 2021 08 03;40(6):455-458.

PMID: 34794789 DOI: 10.1016/j.amj.2021.07.001

OBJECTIVE: The purpose of this study was to obtain a quantitative and qualitative assessment of the SÜPEVAC unit (German Malaysian Medical Industries, Selangor, Malaysia), a novel field suction unit powered by a positive pressure gas source and capable of hospital-grade suction levels and rates.

METHODS: This was a randomized crossover trial in a simulated clinical setting to compare the SÜPEVAC unit with standard hospital wall suction. Twenty-two fellows of the Australasian College for Emergency Medicine, the Australian and New Zealand College of Anaesthetists, or the College of Intensive Care Medicine were recruited. Outcomes were assessed via a structured survey and measuring the time to view the glottis.

RESULTS: This study found there was no significant difference between the SÜPEVAC unit and wall suction with regard to suction time (P = .762; 95% confidence interval, -0.683 to 0.338) or qualitative assessment via the survey.

CONCLUSIONS: The SÜPEVAC unit is comparable with wall suction in a clinical setting. Further research is warranted.

Matched MeSH terms: Suction

Fulltext The magnetohydrodynamic stagnation point flow of a nanofluid over a stretching/shrinking sheet with suction

Mansur S, Ishak A, Pop I

PLoS One, 2015;10(3):e0117733.

PMID: 25760733 DOI: 10.1371/journal.pone.0117733

The magnetohydrodynamic (MHD) stagnation point flow of a nanofluid over a permeable stretching/shrinking sheet is studied. Numerical results are obtained using boundary value problem solver bvp4c in MATLAB for several values of parameters. The numerical results show that dual solutions exist for the shrinking case, while for the stretching case, the solution is unique. A stability analysis is performed to determine the stability of the dual solutions. For the stable solution, the skin friction is higher in the presence of magnetic field and increases when the suction effect is increased. It is also found that increasing the Brownian motion parameter and the thermophoresis parameter reduces the heat transfer rate at the surface.

Matched MeSH terms: Suction

Fulltext A retrospective review of tracheal suction at birth in neonates with meconium aspiration syndrome

Manickam D

Med J Malaysia, 1992 Mar;47(1):60-4.

PMID: 1387452

A retrospective study of 54 neonates with Meconium Aspiration Syndrome (MAS) admitted to the Paediatric ICU Penang General Hospital from January 1989-December 1990 was carried out to determine if suction of the trachea at birth was performed in this group of patients. 63% were inborn and 27% outborn. The mean birth weight was 3.2 kg, 83% were ventilated, mean duration of ventilation was five days and the mortality was 24%. 63% had an Apgar Score of less than 5 at 1 min and 65% had thick meconium-stained liquor. Only 48% were intubated and suctioned at birth. Overall tracheal suction rate was low.

Matched MeSH terms: Suction

Transcanal endoscopic excision of glomus tympanicum: A case report

Teh CS, Azrina A, Fadzilah I, Prepageran N

Med J Malaysia, 2020 03;75(2):189-190.

PMID: 32281609

Glomus tympanicum is a highly vascular tumour traditionally treated surgically via a post-auricular approach. We present here the first published case in Malaysia where total excision was achieved transcanal endoscopically. The procedure was safe, quick and effective due to the better visualisation of the surgical field with the endoscope. Haemostasis was achieved with a modified suction catheter that performed as a functioning suction diathermy.

Matched MeSH terms: Suction

Fulltext Quantification of coral sperm collected during a synchronous spawning event

Teo A, Guest JR, Neo ML, Vicentuan K, Todd PA

PeerJ, 2016;4:e2180.

PMID: 27478697 DOI: 10.7717/peerj.2180

Most studies of coral reproductive biology to date have focused on oocyte numbers and sizes. Only one (ex situ) study has enumerated sperm numbers, even though these data have multiple potential applications. We quantified total coral sperm and eggs per gamete bundle collected from six species in situ during a synchronous spawning event in Singapore. Egg-sperm bundles were captured midwater as they floated towards the surface after being released by the colony. For each sample, a semi-transparent soft plastic bottle was squeezed and released to create a small suction force that was used to 'catch' the bundles. This technique provided several advantages over traditional methods, including low cost, ease of use, no diving prior to the night of collection needed, and the ability to target specific areas of the colony. The six species sampled were Echinophyllia aspera, Favites abdita, F. chinensis, Merulina ampliata, M. scabricula and Platygyra pini. The mean number of sperm packaged within one egg-sperm bundle ranged from 2.04 × 10(6) to 1.93 × 10(7). The mean number of eggs per egg-sperm bundle ranged from 26.67 (SE ± 3.27) to 85.33 (SE ± 17.79). These data are critical for fertilisation success models, but the collection technique described could also be applied to studies requiring in situ spawning data at the polyp level.

Matched MeSH terms: Suction

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