Numerical Study of Flow and Heat Transfer in Confined and Unconfined Round Mist Impinging Jet

2010 ◽  
Author(s):  
Viktor I. Terekhov ◽  
Maksim A. Pakhomov
Keyword(s):  
Heat Transfer ◽  
Numerical Study ◽  
Two Phase ◽  
Euler Approximation ◽  
Flow And Heat Transfer ◽  
Target Wall ◽  
Low Mass ◽  
Model Equations ◽  
The One ◽  
Circular Target

The work presents results of numerical investigation of flow structure and heat transfer of unconfined and confined impact mist jets with low mass fraction of droplets (ML1≤1%). The downward gas-droplets jet is issued from a pipe and strikes into the center of the circular target wall. Mathematical model is based on the solution to RANS equations for the two-phase flow in Euler approximation. For the calculation of the fluctuation characteristics of the dispersed phase model equations of Derevich and Zaichik [1] and Zaichik et al. [2] were applied. Predictions were performed for the distances between the nozzle and the target plate x/(2R) = 0.5–10 and the initial droplets size (d1 = 5–100 μm) at the fixed Reynolds number based on the nozzle diameter, Re = 26600. Addition of droplets causes significant increase of heat transfer intensity in the vicinity of the jet stagnation point compared with the one-phase air impact jet.

scholarly journals A thermal-fluid coupling numerical study on the characteristics of air–oil two phase flow and heat transfer in a micro UAV bearing chamber

RSC Advances ◽  
2017 ◽  
Vol 7 (70) ◽  
pp. 44598-44604 ◽  
Author(s):  
Peng Lu ◽  
Xingwen Zheng ◽  
Wei Li ◽  
Peijie Yang ◽  
Hulin Huang ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Two Phase Flow ◽  
Numerical Study ◽  
Phase Flow ◽  
Two Phase ◽  
Flow And Heat Transfer ◽  
Fluid Coupling ◽  
Coupling Characteristics

Thermal-fluid coupling characteristics of the air–oil two phase flow in a micro UAV bearing chamber are investigated.

A Numerical Study on Flow Boiling in Parallel Microchannels

2008 ◽  
Author(s):  
Jinho Jeon ◽  
Woorim Lee ◽  
Youngho Suh ◽  
Gihun Son
Keyword(s):  
Heat Transfer ◽  
Contact Angle ◽  
Bubble Dynamics ◽  
Numerical Study ◽  
Reverse Flow ◽  
Flow Boiling ◽  
Experimental Studies ◽  
Two Phase ◽  
Flow And Heat Transfer ◽  
Parallel Microchannels

Flow boiling in parallel microchannels has received attention as an effective cooling method for high-power-density microprocessor. Despite a number of experimental studies, the bubble dynamics coupled with boiling heat transfer in microchannels is still not well understood due to the technological difficulties in obtaining detailed measurements of microscale two-phase flows. In this study, complete numerical simulation is performed to further clarify the physics of flow boiling in microchannels. The level set method for tracking the liquid-vapor interface is modified to include the effects of phase change and contact angle. The method is further extended to treat the no-slip and contact angle conditions on the immersed solid. Also, the reverse flow observed during flow boiling in parallel microchannels has been investigated. Based on the numerical results, the effects of channel shape and inlet area restriction on the bubble growth, reverse flow and heat transfer are quantified.

scholarly journals Application of a two-phase thermosyphon loop with minichannels and a minipump in computer cooling

2016 ◽  
Vol 37 (1) ◽  
pp. 3-16 ◽  
Author(s):  
Henryk Bieliński ◽  
Jarosław Mikielewicz
Keyword(s):  
Heat Transfer ◽  
Cooling Capacity ◽  
Phase Flow ◽  
Two Phase ◽  
One Dimensional ◽  
Separate Model ◽  
Flow And Heat Transfer ◽  
The One ◽  
Energy Balances ◽  
Tube Condenser

AbstractThis paper focuses on the computer cooling capacity using the thermosyphon loop with minichannels and minipump. The one-dimensional separate model of two-phase flow and heat transfer in a closed thermosyphon loop with minichannels and minipump has been used in calculations. The latest correlations for minichannels available in literature have been applied. This model is based on mass, momentum, and energy balances in the evaporator, rising tube, condenser and the falling tube. A numerical analysis of the mass flux and heat transfer coefficient in the steady state has been presented.

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