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Journal ArticleDOI

Investigation of flow and heat transfer instabilities and oscillation inhibition of n-decane at supercritical pressure in vertical pipe

01 Oct 2019-Applied Thermal Engineering (Pergamon)-Vol. 161, pp 114143
TL;DR: In this paper, the authors evaluated the characteristics of the flow and heat transfer instabilities of n-decane at supercritical pressures under different inlet temperature, pressure, mass flow, and flow direction conditions.
About: This article is published in Applied Thermal Engineering.The article was published on 2019-10-01. It has received 15 citations till now. The article focuses on the topics: Mass flow & Heat transfer coefficient.
Citations
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Journal ArticleDOI
Xing Sun1, Hua Meng1
TL;DR: In this article, large eddy simulations have been conducted to study upward flows and heat transfer of n-decane in a vertical tube at supercritical pressures, which can be divided into three stages.

22 citations

Journal ArticleDOI
TL;DR: In this paper, the performance of a thermally-driven subcritical and transcritical ejector refrigeration system using refrigerant R32 as the working fluid is studied under different ejector primary flow inlet temperatures and pressures.

17 citations

Journal ArticleDOI
Zaizheng Li1, R. Hoffmann1, Ya Li1, Xiangwen Zhang1, Guozhu Liu1 
TL;DR: In this paper, the convective heat transfer of EHFs with pyrolysis was experimentally investigated in horizontal rectangular channels under supercritical conditions (3.5 MPa, 700°C) with different aspect ratios (λ = 1/6/5) by electrically heated tube test.

15 citations

Journal ArticleDOI
R. Hoffmann1
TL;DR: In this article , the convective heat transfer of EHFs with pyrolysis was experimentally investigated in horizontal rectangular channels under supercritical conditions (3.5 MPa, 700 °C) with different aspect ratios (λ = 1 ~ 5).

12 citations

References
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Journal ArticleDOI
TL;DR: In this paper, the authors review progress in understanding and mitigating the thermal instability/deposition problem of high temperature fuels. But they do not consider the use of carbonaceous material on heat exchanger passages, filters, fuel injectors and other fuel system components.
Abstract: Trends in increasing aircraft speeds and engine efficiencies are increasing vehicle and engine heat loads. Especially at higher Mach numbers, fuel is an attractive heat sink. For many vehicle applications, utilization of this heat sink would increase fuel temperatures beyond critical values, typically 370–400°C (700–750°F). As temperatures increase beyond about 480°C (900°F), this heat addition can lead to thermal/catalytic cracking of the fuel, leading to an “endothermic” fuel. The principal barrier to the use of high temperature fuels is the deposition of carbonaceous material on heat exchanger passages, filters, fuel injectors, and other fuel system components. This paper will review progress in understanding and mitigating the thermal instability/deposition problem.

279 citations

Journal ArticleDOI
TL;DR: The reduction in turbulent, convective heat transfer parameters observed in some supercritical data and in experiments with common gases can be due to radial property variation, acceleration, buoyancy or combinations of these phenomena, depending on the conditions of the applications.

158 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present a comprehensive literature review on three active cooling methods, i.e., regenerative cooling, film cooling, and transpiration cooling, including the fluids flow, heat transfer, and thermal cracking characteristics of different hydrocarbon fuels.

148 citations

Journal ArticleDOI
TL;DR: In this paper, an electrically heated vertical tube (2 mm inner diameter) was applied to carry out thermal cracking of supercritical pressure n-decane at various pressures, temperatures, and resident times.
Abstract: The flow and heat-transfer behavior of thermal cracking n-decane was investigated experimentally and numerically. An electrically heated vertical tube (2 mm inner diameter) was applied to carry out thermal cracking of supercritical pressure n-decane at various pressures, temperatures, and resident times. The results showed that the second-order reactions increase the formation rates of the light products (especially CH4 and C2H4) for conversions greater than 13%, while the heavy product (C5–C9) formation rates are decreased. A global reaction model is given for n-decane conversions less than 13%, including 18 main product species. A computational fluid dynamics (CFD) model was developed using the real thermal properties and coupled with fuel flow, heat transfer, and wall thermal conduction. Three turbulence models were tried out and then compared to the experimental results. The “SST k–ω model” can better predict the wall temperature than other turbulence models. The predicted fuel and wall temperatures a...

148 citations