نتایج جستجو برای: fluid

تعداد نتایج: 220318  

This communication influences on magnetohydrodynamic flow of viscoelastic fluid with magnetic field induced by oscillating plate. General solutions have been found out for velocity and shear stress profiles using mathematical transformations (Integral transforms). The governing partial differential equations have been solved analytically under boundary conditions u(0,t)=A_0 H(t)sinΩt and u(0,t)...

Journal: :international journal of nanoscience and nanotechnology 2015
s. sabbaghi s. mehravar

the aim of this paper is to enhance thermal performance of a microchannel heat sink by using nanoencapsulated phase change material (nepcm) slurry as a cooling fluid instead of pure fluid. a threedimensional model of a circular channel using water slurry of nepcm was developed. the results show a significant reduction in the mean fluid temperature along the channel and heat sink wall temperatu...

A frequency-wavenumber-domain formulation is presented in this paper for calculation of the Green's functions and wave propagation modes in a stratified fluid body underlain by a layered viscoelastic soil medium. The Green's functions define the solid and fluid displacements and fluid pressures due to uniform disk loads acting in either the soil or fluid media. The solution is in the frequency ...

Dynamic behavior of ground supported cylindrical storage tanks (CST) is of crucial importance because of its applications in industrial complexes. Seismic behavior of tanks is greatly affected by the height to diameter ratio, fluid height and fluid type. Five CSTs with different height to diameter ratios, three CSTs with the same height and diameters but various fluid heights and one CST with t...

An accurate description of the fluid flow and heat transfer within a Pressurized Water Reactor (PWR), for the safety analysis and reactor performance is always desirable. In this paper a mathematical model of the fundamental physical phenomena which are associated to a typical PWR is presented. The mathematical model governs the fluid dynamics in the reactor. Using commercial software CFX, a co...

Journal: :journal of theoretical and applied vibration and acoustics 0
mohsen yazdanian young researchers and elite club, ahvaz branch, islamic azad university, ahvaz, iran vahid razavi department of civil engineering, jundi-shapur university of technology, dezful, iran mahmoud mashal department of irigation engineering, aburaihan campus, tehran university, tehran, iran

dynamic behavior of ground supported cylindrical storage tanks (cst) is of crucial importance because of its applications in industrial complexes. seismic behavior of tanks is greatly affected by the height to diameter ratio, fluid height and fluid type. five csts with different height to diameter ratios, three csts with the same height and diameters but various fluid heights and one cst with t...

Journal: :مجله دانشگاه علوم پزشکی کرمانشاه 0
shohreh malek khosravi negin rezavand maryam zangeneh firoozeh veisi neda soleimani abyaneh hamid nomani

background: previous studies have shown that preeclampsia is associated with elevated maternal serum homocysteine levels, but few studies have evaluated homocysteine levels in amniotic fluid in these patients. the purpose of this study was to compare amniotic fluid homocysteine levels in preeclamptic women, with those of normal pregnant women. methods: a cross sectional study was done on 46 pre...

Journal: :iranian endodontic journal 0
mohammad ali saghiri islamic azad university of medical sciences jack ricci , new york university morteza daliri joupari 3. national institute for genetic engineering and biotechnology mohammad aeinehchi islamic azad university of medical sciences kamran ahmadi 5. material and energy research center (merc), karaj, iran niloofar bahramian islamic azad university of medical sciences

introduction : solubility of root filling materials is heavily influenced by the environment they are in contact with. this study compared the solubility of proroot mta in deionized water and synthetic tissue fluid. materials & methods: forty specimens of prepared mta were immersed in deionized water and synthetic tissue fluid (20 samples each). the solubility was assessed after 7 and 28 days. ...

Journal: :journal of heat and mass transfer research 0
sanatan das university of gour banga, malda 732 103, wb, india akram ali university of gour banga, malda 732 103, india rabindra nath jana jana vidyasagar university, midnapore 721 102, india

this paper addresses the combined effects of couple stresses, thermal radiation, viscous dissipation and slip condition on a free convective flow of a couple stress fluid induced by a vertical stretching sheet. the cogley- vincenti-gilles equilibrium model is employed to include the effects of thermal radiation in the study. the governing boundary layer equations are transformed into a system o...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان - دانشکده مهندسی شیمی 1386

بهبود انتقال حرارت جوشش که به عنوان یکی از موثرترین و کارآمدترین فرایندهای انتقال حرارت در کاربردهای متنوع مهندسی رخ می دهد، موضوع تحقیقات متعددی در سالهای اخیر بوده است. انتقال حرارت جوشش تحت تأثیر شار حرارتی دیواره، دمای سطح گرم شونده، شکل سطح، خصوصیات سطح و نیز خصوصیات ترموفیزیکی سیال و حضور مواد افزودنی مثل ذرات جامد، معلق سازها و گازهای محلول می باشد. هدف از این تحقیق بررسی ویژگی های جوشش ...

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