Heat transfer in turbulent flow at very low Prandtl numbers

1983 ◽  
Vol 48 (6) ◽  
pp. 1695-1702
Author(s):  
František Vašák ◽  
Václav Kolář ◽  
Zdeněk Brož
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Turbulent Flow ◽  
Transfer Mechanism ◽  
Final Decision ◽  
Heat Transfer Mechanism ◽  
Prandtl Numbers

An analysis is performed of available experimental data on heat transfer in the region of very low Prandtl numbers 0.005 ⪬ Pr ⪬ 3. None of the verified models on heat transfer mechanism agrees with experimental data in the whole studied region. With regard to a small number of experimental data it is not possible to make a final decision whether the disagreement is due to inacuracies in experiments or on the side of theory.

Numerical Investigation on Saturated Boiling Heat Transfer in a Vertical Rectangular Minichannel

2015 ◽  
Author(s):  
Weihua Cai ◽  
Hongqiang Ma ◽  
Yang Yao ◽  
Yiqiang Jiang
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Numerical Method ◽  
Boiling Heat Transfer ◽  
Nucleate Boiling ◽  
Transfer Mechanism ◽  
Heat Transfer Mechanism ◽  
Vapor Quality ◽  
High Vapor ◽  
Saturated Boiling

A numerical method based on the Euler-Euler model was developed to investigate the mechanism of saturated boiling heat transfer mechanism on upward flow in a vertical rectangular minichannel. This method validated by the experimental data from literature. At the same time, the mechanism of saturated boiling heat transfer was also investigated by ANSYS CFX for Freon R21 at high vapor quality in a vertical rectangular minichannel based on the above numerical method. The results show that the simulation results are good agreement with experimental data from reference and the deviation is within ±15%. The main boiling mechanism is forced convective boiling while the contribution of nucleate boiling is slight for saturated boiling heat transfer at high vapor quality. The evaporation of dispersed liquid phase should be also a main boiling heat transfer mechanism. These results will provide some constructive instructions for the understanding of saturated boiling heat transfer phenomenon in a vertical rectangular minichannel of PFHE.

Heat transfer mechanism driven by acoustic body force under acoustic fields

2021 ◽  
Vol 6 (7) ◽  
Author(s):  
Varun Kumar ◽  
Mohammed Azharudeen ◽  
Charish Pothuri ◽  
Karthick Subramani
Keyword(s):  
Heat Transfer ◽  
Body Force ◽  
Transfer Mechanism ◽  
Acoustic Fields ◽  
Heat Transfer Mechanism
Sign in / Sign up

Export Citation Format

Share Document