نتایج جستجو برای: constant wall temperature
تعداد نتایج: 806907 فیلتر نتایج به سال:
Currently, efficient heat transmission for compact electronic elements is an essential matter. It needs a sink with liquid cooling scheme that meets these demands as much feasible. The dimensions of 50.8 × 40.6 5.5 mm were adopted features transfer well 
 the fluid flow supercritical CO2 in this study. pressures, tem-peratures, and mass velocity ranges 7.5 to 12 MPa, 35 50oC, 100 500 Kg/m2...
In this study, several variable turbulent Prandtl number formulations are examined for boundary layers, pipe flow, and axisymmetric jets. The model formulations include simple algebraic relations between the thermal diffusivity and turbulent viscosity as well as more complex models that solve transport equations for the thermal variance and its dissipation rate. Results are compared with availa...
natural convection heat transfer has many applications in different fields of industry; such as cooling industries, electronic transformer devices and ventilation equipment; due to simple process, economic advantage, low noise and renewed retrieval. recently, heat transfer of nanofluids have been considered because of higher thermal conductivity coefficient compared with those of ordinary fluid...
This paper presents a theoretical investigation of the second law performance of double diffusive forced convection in microreactors with the inclusion of nanofluid and radiation effects. The investigated microreactors consist of a single microchannel, fully filled by a porous medium. The transport of heat and mass are analysed by including the thick walls and a first order, catalytic chemical ...
In this paper the effect of wall waviness of side walls in a two-dimensional wavy enclosure is numerically investigated. Two vertical wavy walls and straight top wall are kept isothermal and the bottom wall temperature is higher and spatially varying with cosinusoidal temperature distribution. A computational code based on Finite-volume approach is used to solve governing equations and SIMPLE m...
a = mean speed of sound, R T 1=2 aw = mean speed of sound at the wall, RTw 1=2 C = turbulent viscosity parameter, T= Lk cp = specific heat at constant pressure, R= 1 ; 1004:5 J= kg K cv = specific heat at constant volume, R= 1 ; 717:5 J= kg K f = uniform body force, w=h h = half channel height hw = wall length scale, h=Re i = turbulence intensity, 2k=3 = U1 k = turbulent kinetic energy, uiui=2 ...
The paper presents results of the modelling heat transfer at film boiling a liquid in porous medium on vertical heated wall. Such processes are observed cooling high-temperature surfaces pipes, microstructural radiators etc. Heating conditions wall were constant temperature or flux.
 An analytical solution was obtained for problem fluid flow and using model Darcy-Brinkman. It shown that le...
We discuss the use of a Langevin equation with a colored (correlated) noise to perform constanttemperature molecular dynamics simulations. Since the equations of motion are linear in nature, it is easy to predict the response of a Hamiltonian system to such a thermostat and to tune at will the relaxation time of modes of different frequency. This allows one to optimize the time needed to therma...
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