Results 261 to 270 of about 23,246 (292)

Deterioration of heat transfer in turbulent channel flows due to nanoparticles

International Journal of Heat and Mass Transfer, 2021
Abstract Custom-designed nanoparticles offer the possibility of influencing the thermo-physical properties of heat carriers, such as water and transformer oil. The present study aims to clarify to what extent such nanofluids may improve convective heat transfer under turbulent flow conditions.
Silvio Tschisgale, Tobias Kempe
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On the heat transfer deterioration during condensation of binary mixtures

Applied Physics Letters, 2019
Heat transfer processes involving binary- and multicomponent mixtures are ubiquitous in nature, particularly in several industries like the chemical and petrochemical ones. Condensation of binary mixtures inside pipes has been extensively studied during the past decades for unraveling the physical mechanisms controlling heat transfer. In particular, it
C. A. Dorao, M. Fernandino
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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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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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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
openaire   +1 more source

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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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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Deterioration of heat transfer to supercritical helium at 2·5 atmospheres

International Journal of Heat and Mass Transfer, 1975
Abstract Heat transfer has been investigated for supercritical helium at 2·5 atm flowing inside a vertical tube with inlet bulk fluid temperatures less than the transposed critical temperature. Results indicate that for high heat flux conditions, the heat-transfer coefficient passes through a maximum and then deteriorates as the fluid temperature ...
Patricia J. Giarratano, M.C. Jones
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NEW INSIGHT INTO HEAT TRANSFER DETERIORATION

Proceeding of International Heat Transfer Conference 17, 2023
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The nature of wall temperature distributions in regions of deteriorated heat transfer

Cryogenics, 1978
Abstract This note concerns the difficulty of fitting heat transfer correlations to data in deteriorated forced convective flows of supercritical pressure fluids. Experimental data suggests that the heat transfer coefficient depends inversely upon wall to bulk temperature difference, causing the wall temperature to become very sensitive to secondary ...
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