Results 221 to 230 of about 22,182 (258)

Heat transfer and hydraulic resistance of supercritical pressure coolants. Part IV: Problems of generalized heat transfer description, methods of predicting deteriorated heat transfer; empirical correlations; deteriorated heat transfer enhancement; dissolved gas effects

International Journal of Heat and Mass Transfer, 2014
Abstract The review and analysis of existed recommendations for predicting the conditions, when a cumulative effect of the factors that lead to heat transfer deterioration becomes significant, and determining the boundaries of normal heat transfer are presented. The correlations for calculating deteriorated heat transfer are given.
V.A. Kurganov, Yu.A. Zeigarnik, I.V. Maslakova   +2 more
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Numerical Analysis of Deterioration in Heat Transfer to Near-Critical Rocket Propellants

Numerical Heat Transfer, Part A: Applications, 2010
Liquid propellants, which are typically used for regenerative cooling of rocket thrust chambers, can flow in channels at supercritical pressures and in the neighborhood of pseudocritical temperature (near-critical fluid). This could be for instance the case for the envisioned liquid-oxygen/liquid-methane engines with chamber pressures larger than about
PIZZARELLI, MARCO, URBANO, ANNAFEDERICA, NASUTI, Francesco   +2 more
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Visualization Investigation of Secondary Flow on Heat Transfer Deterioration in Horizontal Heat Tube

Volume 2A: Thermal Hydraulics, 2014
Mixed convection heat transfer in heated tubes has been studied extensively in the past decades, which is widely used in various industrial fields such as cooling of a nuclear reactor core. The secondary flow, which is induced by buoyancy force, has been found in previous research to have profound influence on the heat transfer difference on ...
Chao Wu, Hui-xiong Li, Qian Zhang
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The Investigation of Heat Transfer Deterioration in Supercritical Water Heating Systems

Volume 6: Thermal-Hydraulics and Safety Analysis
Abstract The object of this study is to investigate the heat transfer deterioration (HTD) in the supercritical water (SCW) heating systems. The present study develops a new empirical correlation for predicting the onset heat flux of HTD in SCW and are compared with the existing ones in literature.
Yu-Sen Chen, Jin-Der Lee, Shao-Wen Chen
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Deteriorated turbulent heat transfer (DTHT) of gas up-flow in a circular tube: Heat transfer correlations

International Journal of Heat and Mass Transfer, 2008
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Lee, JI Lee, JeongIk, Hejzlar, P, Saha, P, Kazimi, MS, McEligot, DM   +4 more
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A CFD-derived correlation for methane heat transfer deterioration

Numerical Heat Transfer, Part A: Applications, 2015
ABSTRACTMethane heat-transfer deterioration can occur in the regenerative cooling channels of future liquid-oxygen/liquid-methane rocket engines with chamber pressures higher than about 50 bar. Aiming to improve the prediction capabilities for the design of such systems, in the present study, a Nusselt number correlation able to describe the convective
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Heat Transfer Deterioration Onset of Hydrocarbon Fuel at Supercritical Pressure

Volume 5B: Heat Transfer, 2017
The present study pays attention to the pressure effect and geometric effect on heat transfer deterioration onset to supercritical hydrocarbon fuel. Numerical simulation about heat transfer deterioration of hydrocarbon fuel flowing upward in vertical round tubes with various diameter at supercritical pressure was performed.
Zeyuan Cheng, Zhi Tao, Jianqin Zhu, Haiwang Li, Longyun Wang   +4 more
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Numerical analysis of deterioration phenomena in heat transfer to supercritical water

International Journal of Heat and Mass Transfer, 1995
Abstract Deterioration in heat transfer at supercritical water cooling in a vertical pipe is numerically analyzed. The calculation is based on a parabolic solver for steady-state equations in r−z two dimensions, a k−ϵ model for turbulence and a steam table library for physical properties of supercritical water.
S. Koshizuka, N. Takano, Y. Oka
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Conditions for the occurrence of heat transfer deterioration in light hydrocarbons flows

International Journal of Heat and Mass Transfer, 2013
Abstract Heat transfer deterioration could affect heated channel flows of supercritical pressure fluids in a number of technological applications. Aim of the present study is to analyze the phenomenon onset and to investigate its dependence on the pressure, for three light hydrocarbons: methane, ethane and propane. To this goal a parametric numerical
URBANO, ANNAFEDERICA, NASUTI, Francesco
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An Experimental Study of Heat Transfer Deterioration at Supercritical Pressures

2017
Convective heat transfer to CO2 flowing upward in electrically heated vertical tubes at supercritical pressures was studied for wall heat fluxes q within ranges that included values corresponding to the onset of heat transfer deterioration (HTD). The inlet pressure was P = 8.35 MPa, the mass flux was in the range 200 kg/m2s ≤ G ≤ 1500 kg/m2s, and the ...
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