Numerical Simulation of Friction and Heat Exchange in Viscous-Gravitational Fluid Flow in a Loop Thermosiphon

2020 ◽  
Vol 93 (5) ◽  
pp. 1275-1284
Author(s):  
L. A. Sukomel ◽  
O. N. Kaban’kov ◽  
V. B. Ankudinov
Keyword(s):  
Numerical Simulation ◽  
Fluid Flow ◽  
Heat Exchange

Numerical Simulation of Heat and Fluid Flow in a Basic Pulse-Tube Refrigerator

2004 ◽  
Author(s):  
Takao Koshimizu ◽  
Hiromi Kubota ◽  
Yasuyuki Takata ◽  
Takehiro Ito
Keyword(s):  
Numerical Simulation ◽  
Fluid Flow ◽  
Heat Exchange ◽  
Surface Heat ◽  
Physical Models ◽  
The Other ◽  
Pulse Tube ◽  
Working Principle ◽  
Pulse Tube Refrigerators ◽  
Heat And Fluid Flow

The working principle of refrigeration in basic pulse-tube refrigerators (BPTR) has been explained by the mechanism called surface heat pumping (SHP) that heat is conveyed from the cold end to the hot end of the pulse tube by the successive heat exchange between the working gas and the wall. In this study, a numerical simulation has been performed to clarify the effect of the wall in BPTRs by comparing the numerical results in two physical models; one is the model considering the heat exchange between the working gas and the wall (HE model), and the other is the model ignoring that (AW model). As a result, the importance in the effect of the wall was shown clearly. In addition, the mechanism of refrigeration other than the SHP was made clear in the AW model.

CFD-Based Study of Velocity and Temperature Distribution among Rib-Tube in Heat Environment

2014 ◽  
Vol 487 ◽  
pp. 558-561
Author(s):  
Su Hou De ◽  
Zhang Yu Fu ◽  
Che Ji Yong ◽  
Wu Shi Lei ◽  
Xiao Long Wen
Keyword(s):  
Numerical Simulation ◽  
Fluid Flow ◽  
Heat Exchange ◽  
Temperature Distribution ◽  
Velocity Distribution ◽  
Engineering Application ◽  
Dispersed Phase ◽  
Wall Function ◽  
Governing Equations ◽  
Theory Analysis

The velocity distribution coupled thermal and fluid flow a rib-tube was studied in this article. Based on theory analysis and numerical simulation, we choose modal and wall function to simulate the flow in rib-tube, velocity to definite the dispersed phase. The governing equations were built and solved by numerical way. The progress of flow and heat exchange in rib-tube, the rules and contours of temperature, velocity were obtained, they shows that, along the rib-tube, velocity was changed with the temperature rising , which could give us a reference for engineering application .

Numerical Simulation of Liquefied Natural Gas in Rib-Tube

2013 ◽  
Vol 483 ◽  
pp. 162-165
Author(s):  
Su Hou De ◽  
Zhang Yu Fu ◽  
Ji Yong Che ◽  
Xiao Long Wen
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Fluid Flow ◽  
Heat Exchange ◽  
Natural Gas ◽  
Liquefied Natural Gas ◽  
Dispersed Phase ◽  
Wall Function ◽  
Governing Equations ◽  
Set Up

The flow of liquefied natural gas (LNG) which was coupled between heat transfer and fluid-flow in rib-tube was studied in this paper. Based on theoretical analysis, the model and wall-function were chosen to simulate the flow field of rib-tube, and the multiphase flow was described by the mixture model, in which the dispersed phase was defined by different velocity. In addtion, self-defining functions were used and governing equations were set up to solve the dispersed phase, and the result were compared with the experiment. The process of fluid-flow and heat exchange on rib-tube was simulated, and the contours of temperature, pressure, velocity, gas fraction were obtained, which showed that, the parameters of above changed when the temperature was rising and the LNG evaporating along the rib-tube, and a mixed process existed in the middle of the heat tube.

scholarly journals HEAT EXCHANGE OF ELECTRIC CONDUCTIVE LIQUID AT LARGE VALUES OF THE REYNOLD'S MAGNETIC NUMBER

2021 ◽  
pp. 12-22
Author(s):  
С.В. Соловьев ◽  
Т.С. Соловьева
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Reynolds Number ◽  
Fluid Flow ◽  
Heat Exchange ◽  
Spherical Layer ◽  
Magnetic Reynolds Number ◽  
Electrically Conductive ◽  
Conductive Liquid ◽  
Nusselt Numbers

Представлены результаты численного моделирования нестационарного конвективного теплообмена и магнитной гидродинамики электропроводной жидкости в сферическом слое при граничных условиях для температуры первого рода. Исследовано влияние величины магнитного числа Рейнольдса на эволюцию структуры течения жидкости, поле температуры, магнитной индукции и распределение чисел Нуссельта. The results of numerical simulation of unsteady convective heat transfer and magneto hydrodynamics of an electrically conductive fluid in a spherical layer under boundary conditions for a temperature of the first kind are presented. The influence of the value of the magnetic Reynolds number on the evolution of the structure of the fluid flow, the field of temperature, magnetic induction and the distribution of Nusselt numbers is investigated.

Results of the Numerical Simulation of the Entropy Flow Generated at the Fluid Flow with Friction and Heat Exchange

2014 ◽  
Vol 659 ◽  
pp. 493-498
Author(s):  
Haralambie Mihail Vartolomei
Keyword(s):  
Numerical Simulation ◽  
Fluid Flow ◽  
Heat Exchange ◽  
Entropy Generation ◽  
Simulation Program ◽  
Design Parameters ◽  
Entropy Flow ◽  
Design Change ◽  
Global Configuration

The minimization of the entropy generation is fundamental for the thermodynamic design. Based on theoretical relations contained in the references [1,2,3,4], a numerical simulation program of the entropy flow generated at the flow with friction and heat exchange was developed, whose results are included herein. From their analysis it is clear that between irreversibility and design parameters there isn’t a monotonous dependence, and that, by the mere intuition, without a directed concern, we cannot predict the effect of a design change on the global configuration of irreversibility.

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