The generality of equations for mixed-convective heat transfer to liquids at supercritical pressure in vertical pipes

1986 ◽  
Vol 50 (6) ◽  
pp. 666-670 ◽  
Author(s):  
V. A. Bogachev ◽  
V. M. Eroshenko
Keyword(s):  
Heat Transfer ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Supercritical Pressure

NUMERICAL INVESTIGATION ON CONVECTIVE HEAT TRANSFER OF SUPERCRITICAL PRESSURE CO2 IN SERPENTINE CHANNEL

2018 ◽  
Author(s):  
Xinying Cui ◽  
Jiangfeng Guo ◽  
Xiulan L. Huai ◽  
Keyong Cheng ◽  
Haiyan Zhang ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Convective Heat Transfer ◽  
Numerical Investigation ◽  
Convective Heat ◽  
Supercritical Pressure ◽  
Serpentine Channel

scholarly journals Convective heat transfer characteristics of China RP-3 aviation kerosene at supercritical pressure

2011 ◽  
Vol 31 (14-15) ◽  
pp. 2360-2366 ◽  
Author(s):  
Xunfeng Li ◽  
Xiulan Huai ◽  
Jun Cai ◽  
Fengquan Zhong ◽  
Xuejun Fan ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Supercritical Pressure ◽  
Heat Transfer Characteristics ◽  
Aviation Kerosene ◽  
Transfer Characteristics

Experimental Investigation of Convective Heat Transfer of Supercritical Pressure Hydrocarbon Fuel in a Horizontal Section of a Rotating U-Duct

2019 ◽  
Vol 141 (10) ◽  
Author(s):  
Zelong Lu ◽  
Yinhai Zhu ◽  
Yuxuan Guo ◽  
Peixue Jiang
Keyword(s):  
Heat Transfer ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Rotational Speed ◽  
Convective Heat Transfer Coefficient ◽  
Supercritical Pressure ◽  
Heat Fluxes ◽  
Secondary Flows ◽  
Horizontal Section ◽  
Static Conditions

Abstract The experimental and numerical investigations of the heat transfer of supercritical pressure n-decane flowing through a pipe at various rotational speeds, mass flow rates, heat fluxes, and pressures, are presented. This pipe is 2 mm in diameter, 200 mm in length, with a radius of 0.328 m, and is parallel to the rotating axis. The wall temperature was measured at four positions around the periphery of the pipe at each of the five selected cross section along the pipe's length. Maximum convective heat transfer was observed at the outer edge of the horizontal section, while its corresponding minimum was observed at the inner edge. The heat transfers at the two sides of the channel were observed to be similar. The density and pressure differences between the outer and inner edges increased at increasing rotating speeds. However, the temperature difference between the outer and inner edges decreased with increased rotational speed mainly because of the increase of secondary flows in the section. The section's average convective heat transfer coefficient increased with an increase in the rotational speed, and its value at 1000 rpm was approximately twice than that at static conditions. The phenomenon of oscillation was observed near the exit of the horizontal section, and was caused by the flow and considerable property changes near the pseudo critical temperature. A computational fluid dynamics (CFD) model was developed using the real gas thermal properties and was coupled with the heat transferred owing to fuel flow. The predicted fuel and wall temperatures were in good agreement with the experimental data. A new local Nusselt number correlation of the heat transfer of n-decane in a rotating horizontal section was proposed.

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

2018 ◽  
Vol 4 (3) ◽  
Author(s):  
Yu Ji ◽  
Jun Sun ◽  
Lei Shi
Keyword(s):  
Heat Transfer ◽  
Velocity Profile ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Supercritical Pressure ◽  
Bulk Temperature ◽  
High Heat Flux ◽  
Straight Tube ◽  
Heat Transfer Deterioration ◽  
Pressure Hydrogen

Hydrogen is adopted as coolant for regenerative cooling nozzle and reactor core in nuclear thermal propulsion (NTP), which is a promising technology for human space exploration in the near future due to its large thrust and high specific impulse. During the cooling process, the hydrogen alters its state from subcritical to supercritical, accompanying with great variations of fluid properties and heat transfer characteristics. This paper is intended to study heat transfer processes of supercritical pressure hydrogen under extremely high heat flux by using numerical approach. To begin with, the models explaining the variation of density, specific heat capacity, viscosity, and thermal conductivity are introduced. Later on, the convective heat transfer to supercritical pressure hydrogen in a straight tube is investigated numerically by employing a computational model, which is simplified from experiments performed by Hendricks et al. During the simulation, the standard k–ε model combining the enhanced wall treatment is used to formulate the turbulent viscosity, and the results validates the approach through successful prediction of wall temperature profile and bulk temperature variation. Besides, the heat transfer deterioration which may occur in the heat transport of supercritical fluids is also observed. According to the results, it is deduced that the flow acceleration to a flat velocity profile in the near wall region due to properties variation of hydrogen contributes to the suppression of turbulence and the heat transfer deterioration, while the “M-shaped” velocity profile is more often correlated to the starting of a recovery phase of turbulence production and heat transfer.

Mixed convective heat transfer of water in a pipe under supercritical pressure

2005 ◽  
Vol 34 (8) ◽  
pp. 608-619 ◽  
Author(s):  
Feng Xu ◽  
Liejin Guo ◽  
Bofeng Bai
Keyword(s):  
Heat Transfer ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Supercritical Pressure
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