Experimental investigation and theoretical analysis on the heat transfer deterioration of supercritical CO2 in mixed and forced convection in vertical-straight tube with downward flow

2022 ◽  
Vol 187 ◽  
pp. 122510
Author(s):  
Shijie Zhang ◽  
Xiaoxiao Xu ◽  
Chao Liu ◽  
Xiaoxiao Li ◽  
Chuang Wu ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Theoretical Analysis ◽  
Forced Convection ◽  
Supercritical Co2 ◽  
Straight Tube ◽  
Downward Flow ◽  
Heat Transfer Deterioration

Experimental investigation on heat transfer of forced convection condensation of ethanol–water vapor mixtures on a vertical mini-tube

2013 ◽  
Vol 49 (9) ◽  
pp. 1231-1241 ◽  
Author(s):  
Xiping Chen ◽  
Daotong Chong ◽  
Jinshi Wang ◽  
Ronghai Huang ◽  
Junjie Yan
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Water Vapor ◽  
Forced Convection ◽  
Vapor Mixtures

Numerical Investigation of Convective Heat Transfer to Supercritical Hydrogen in a Straight Tube

2017 ◽  
Author(s):  
Yu Ji ◽  
Lei Shi ◽  
Jun Sun
Keyword(s):  
Heat Transfer ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Specific Impulse ◽  
Local Heat Transfer ◽  
Heat Transfer Process ◽  
Subcritical State ◽  
High Heat Flux ◽  
Straight Tube ◽  
Heat Transfer Deterioration

Hydrogen is adopted as coolant for regenerative cooling nozzle and reactor reflector in nuclear thermal propulsion (NTP), which may be a promising technology for human space exploration in the near future due to its large thrust and high specific impulse. During the cooling processes, the hydrogen experiences the transition from subcritical state to supercritical state, which influences the heat transfer severely. This paper is intended to study the characteristic of convective heat transfer to supercritical hydrogen in a straight tube under high heat flux through numerical simulation, which is a common phenomenon in NTP operation. The thermophysical properties and transport properties including the equation of state, specific heat capacity, viscosity and thermal conductivity of hydrogen are evaluated firstly by compared with the data from National Institute of Standards and Technology (NIST). Then, the flow and heat transfer process is investigated using Reynolds Averaged Naiver-Stokes (RANS) model, and the approach is validated by the successfully predicted behavior called local heat transfer deterioration. Moreover, the mechanism of heat transfer deterioration is analyzed briefly according to the detailed information of flow field. This work herein contributes to the further NTP design and research.

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