TWO-PHASE FLOW PATTERNS OF A TOP HEAT MODE CLOSED LOOP OSCILLATING HEAT PIPE WITH CHECK VALVES (THMCLOHP/CV)

2016 ◽  
Keyword(s):  
Heat Pipe ◽  
Closed Loop ◽  
Two Phase Flow ◽  
Flow Patterns ◽  
Phase Flow ◽  
Two Phase ◽  
Oscillating Heat Pipe ◽  
Heat Mode

scholarly journals Visual study on two-phase flow in a horizontal closed-loop oscillating heat pipe

2019 ◽  
Vol 23 (2 Part B) ◽  
pp. 1055-1065
Author(s):  
Piyanun Charoensawan ◽  
Pradit Terdtoon
Keyword(s):  
Heat Pipe ◽  
Closed Loop ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Oscillating Heat Pipe ◽  
Visual Study

scholarly journals MATHEMATICAL MODEL OF HEAT TRANSFER IN A MICROCHANNEL HEAT PIPE WITH CIRCULATING TWO-PHASE FLOW

2020 ◽  
Vol 55 ◽  
pp. 62-67
Author(s):  
Rufat Sh. Abiev ◽  
◽  
Ritunesh Kumar ◽  
Keyword(s):  
Heat Transfer ◽  
Mathematical Model ◽  
Heat Pipe ◽  
Two Phase Flow ◽  
Experimental Studies ◽  
Phase Flow ◽  
Two Phase ◽  
Experimental Proof ◽  
Oscillating Heat Pipe ◽  
Taylor Flow

In addition to the previously created hydrodynamics model, a mathematical model describing the heat transfer parameters of two-phase flow is constructed. Particular role of longitudinal convection in the heat transport is shown. The experimental studies confirmed a microchannel heat pipe operability with a two-phase flow in a circulating mode. A circulating two-phase Taylor flow in microchannel was considered to be more efficient for overall heat transfer in a heat pipe compared to the pulsating (oscillating) heat pipe. The advantages of circulating two-phase Taylor flow related to the pulsating heat pipes are discussed on the proposed mathematical model basis. The conditions of experimental proof of the proposed mathematical model were elaborated.

scholarly journals A213 Development of liquid-gas two-phase flow solver towards simulation of oscillating heat pipe by large-scale parallel computers

2014 ◽  
Vol 2014 (0) ◽  
pp. _A213-1_-_A213-2_
Author(s):  
Shun Takahashi ◽  
Taku Nonomura ◽  
Yousuke Masuyama ◽  
Kensei Shimizu ◽  
Akiko Kawachi ◽  
...  
Keyword(s):  
Heat Pipe ◽  
Large Scale ◽  
Two Phase Flow ◽  
Parallel Computers ◽  
Phase Flow ◽  
Two Phase ◽  
Flow Solver ◽  
Oscillating Heat Pipe

Numerical Simulation of Vapor-Liquid Two-Phase Flow in a Closed Loop Oscillating Heat Pipe

2009 ◽  
Author(s):  
Xiangdong Liu ◽  
Yingli Hao
Keyword(s):  
Mathematical Model ◽  
Slug Flow ◽  
Annular Flow ◽  
Closed Loop ◽  
Two Phase Flow ◽  
Working Fluid ◽  
Phase Flow ◽  
Two Phase ◽  
Oscillating Heat Pipe ◽  
Vapor Liquid

A comprehensive mathematical model including the effects of vapor-liquid interface and surface tension was proposed to describe the vapor-liquid two-phase flow, heat and mass transfer and the phase change process in a closed loop oscillating heat pipe (CLOHP). The vapor-liquid two-phase flow in a typical CLOHP was numerically investigated using the proposed mathematical model and the VOF method. The comparisons between the computational and experimental results indicated that the proposed model could successfully simulate the initial distribution of working fluid, the complex flow patterns during different operation conditions, such as bubbly flow, slug flow, semi-annular/annular flow, back flow, and the flow pattern transitions in the CLOHP. The phenomenon that semi-annular/annular flow and slug flow formed in alternating vertical tubes at the initial stage of working fluid circulation was also simulated successfully. Those results were in good agreement with the experimental observations. The flow and heat transfer of a working fluid in two transition sections, and the effects of heating power on the interval flow patterns, were analyzed based on the numerical simulation. The results showed that the changes of temperature, pressure and flow pattern were obvious in the transition section between adiabatic section and condenser section, where the transition of heat transfer condition occurred. The violent boiling might occur in the evaporator section under the high heating power of 100 W and 120 W. The preliminary results indicated that the mathematical model proposed in present paper could effectively reveal the complex vapor-liquid two-phase flow in CLOHP, which established a basis for the further study of complex working mechanisms of CLOHP and effects of operation parameters.

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