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A mechanism of heat transfer enhancement or deterioration of nanofluid flow boiling
International Journal of Heat and Mass Transfer, 2020Abstract In present work, the heat transfer characteristics of SiC/H2O and Graphite/H2O nanofluids flow boiling are experimentally studied with the consideration of pressure, mass flux and heat flux. Compared with based fluid, both enhancement and deterioration of nanofluids boiling heat transfer are found.
Yun Wang, Junmei Wu, Guanghui Su
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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 ...
Kline, Nathan
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Evaluation of identification methods for heat transfer deterioration of supercritical CO2
International Communications in Heat and Mass Transfer, 2023Qinggang Qiu, Xiaojing Zhu
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Heat transfer under supercritical pressures and heat transfer deterioration boundaries
Thermal Engineering, 2006Some relations for technical calculations of the normal heat transfer in a rising water flow under supercritical pressure (SCP) are analyzed and compared with recent experimental data obtained at the Institute of Physics and Engineering (Obninsk). The accuracy of recommendations concerning the calculation of heat transfer is estimated.
V. A. Grabezhnaya, P. L. Kirillov
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Heat transfer deterioration in a supercritical water channel
Nuclear Engineering and Design, 2010Abstract Supercritical water is the working fluid in the supercritical water reactor (SCWR) because of its high thermal efficiency and simplicity. Computational fluid dynamics (CFD) technology has been applied in the studies of supercritical water in circular channels by solving conservation equations of mass, momentum, and energy.
Min-Tsung Kao +3 more
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Deterioration in heat transfer of endothermal hydrocarbon fuel
Journal of Thermal Science, 2011Numerical studies under supercritical pressure are carried out to study the heat transfer characteristics in a single-root coolant channel of the active regenerative cooling system of the scramjet engine, using actual physical properties of pentane. The relationships between wall temperature and inlet temperature, mass flow rate, wall heat flux, inlet ...
Weixing Zhou +3 more
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Heat Transfer at Supercritical Pressures and the Onset of Deterioration
Volume 2: Thermal Hydraulics, 2006The comparison of the data on heat transfer at supercritical pressures (SCP) demonstrates that they have a considerable spread, which shows a complex nature of the process and a probable inaccuracy in the methods of data processing caused by a sharp change in thermophysical properties near the pseudocritical point.
Pavel L. Kirillov, Vera A. Grabezhnaya
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On the Onset of Heat Transfer Deterioration in Supercritical Coolant Flow Channels
43rd AIAA Thermophysics Conference, 2012The deterioration of forced convection heat transfer can affect channel flows of supercritical fluids, and therefore has to be taken in consideration when dealing with regenerative cooling of liquid rocket engines. A threshold value of the ratio between the heat flux and the specific mass flow rate is identified as the main parameter controlling the ...
URBANO, ANNAFEDERICA, NASUTI, Francesco
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Deterioration of Heat Transfer at Supercritical Pressures of a Substance
Journal of Engineering Physics and Thermophysics, 2001Results of an experimental investigation of the transition from the enhanced mode of heat transfer to a deteriorated mode at supercritical pressures of toluene are presented.
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