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Journal ArticleDOI

Flow dynamics in transient heat transfer of n-decane at supercritical pressure

TL;DR: In this article, the effects of surface heat flux, surface heating rate, cooling tube length, and inlet flow velocity on the transient responding behaviors of n -decane at a supercritical pressure of 5MPa was numerically investigated.
About: This article is published in International Journal of Heat and Mass Transfer.The article was published on 2017-12-01. It has received 16 citations till now. The article focuses on the topics: Internal combustion engine cooling & Convection.
Citations
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Journal ArticleDOI
Keyu Gong1, Yong Cao1, Yu Feng1, Shuyuan Liu1, Jiang Qin1 
TL;DR: In this article, a mathematical model with a detailed pyrolytic reaction mechanism of China RP-3 aviation kerosene was established to understand the influence of secondary reactions on heat transfer in reacting flow of supercritical hydrocarbon fuel.

31 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of secondary flows and heat flux redistribution induced by buoyancy on supercritical-pressure heat transfer were analyzed, and it was shown that drastic variations of the fuel density with temperature at a supercritical pressure of 3 MPa induce strong buoyancy effect on heat transfer.

28 citations

Journal ArticleDOI
Sufen Li1, Yuning Wang1, Ming Dong1, Hang Pu1, Si Jiao1, Yan Shang1 
TL;DR: In this article, the effects of inlet pressure, wall heat flux and inlet Reynolds number on flow and heat transfer instabilities of RP-3 aviation kerosene under supercritical pressures in a vertical tube with inner diameter of 2.

23 citations

Journal ArticleDOI
TL;DR: In this paper, the heat transfer characteristics affected by the buoyancy-driven supercritical hydrocarbon fuel flow in a rectangular channel are numerically explored in detail and a three-dimensional numerical model is simulated with a verified SST k-ω turbulence model at real working conditions.

22 citations

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

References
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Journal ArticleDOI
K. Yamagata1, Kaneyasu Nishikawa1, Shu Hasegawa1, T. Fujii1, S Yoshida1 
TL;DR: In this article, a comprehensive set of data was obtained for pressures from 226 to 294 bar, bulk temperatures from 230 to 540°C, heat fluxes from 116 to 930 kW/m 2 and mass velocities from 310 to 1830 kg/m2s.

570 citations

Journal ArticleDOI
TL;DR: In this article, the authors describe the evolution of liquid fuels for aircraft and rockets as the engines and vehicles they fuel have undergone these signiµ cant increases in performance, and compare the performance of aircraft and vehicles with those of the space shuttle.
Abstract: Introduction M AJOR increases in liquid-fueled propulsion performance have occurred in the past 100 years.TheWright brothersŽ rst  ew on 14 December 1903 with an engine that generated slightly more than 130 lb of thrust for  ights that ranged from 120 to 850 ft (Ref. 1). Contrast that with current aircraft such as the Boeing 777, which can  y 8000 n miles, equipped with engines from the GE90 and PW4000 series that generate over 100,000 lb of thrust. The Wright brothers probably consumed less than a gallon of gasoline in that Ž rst day of  ight tests. In 1997, airlines consumedan average of 177 million gal/day of jet fuel worldwide.2¤ Robert Goddard’s Ž rst  ight of a liquid rocket on 16March 1926 reachedan altitudeof 41 ft and landed184 ft from the launchpoint (seeRef. 3). Again, the contrast with current vehicles such as the space shuttle, which can lift over 50,000 lb to 200C miles into low Earth orbit, is dramatic. The intent of this paper is to describe the evolution of liquid fuels for aircraft and rockets as the engines and vehicles they fuel have undergone these signiŽ cant increases in performance.

517 citations

Journal ArticleDOI
TL;DR: In this article, an investigation was conducted to explore the endothermic potential of practical fuels, with inexpensive and readily available catalysts, under operating conditions simulative of high-speed flight applications.
Abstract: Storable hydrocarbon fuels that undergo endothermic reaction provide an attractive heat sink for future high-speed aircraft. An investigation was conducted to explore the endothermic potential of practical fuels, with inexpensive and readily available catalysts, under operating conditions simulative of high-speed flight applications. High heat sink capacities and desirable reaction products have been demonstrated for n-heptane and Norpar 12 fuels using zeolite catalysts in coated-tube reactor configurations. The effects of fuel composition and operating condition on extent of fuel conversion, product composition, and the corresponding endotherm have been examined. The results obtained in this study provide a basis for catalytic-reactor/ heat-exchanger design and analysis.

237 citations

Journal ArticleDOI
TL;DR: In this paper, a unified treatment of general fluid thermodynamics is developed to handle fluid flows over their entire thermodynamic states, based on the concepts of partial-mass and partial-density properties, and accommodates thermodynamic nonidealities and transport anomalies in the transcritical regime.

211 citations

Journal ArticleDOI
TL;DR: In this article, the heat transfer characteristics of China no. 3 kerosene were investigated experimentally and analytically under conditions relevant to a regenerative cooling system for scramjet applications.
Abstract: The heat transfer characteristics of China no. 3 kerosene were investigated experimentally and analytically under conditions relevant to a regenerative cooling system for scramjet applications. A test facility developed for the present study can handle kerosene in a temperature range of 300-1000 K, a pressure range of 2.6-5 MPa, and a mass How rate range of 10-100 g/s. In addition, the test section was uniquely designed such that both the wall temperature and the bulk fuel temperature were measured at the same location along the flowpath. The measured temperature distributions were then used to analytically deduce the local heat transfer characteristics. A 10-component kerosene surrogate was proposed and employed to calculate the fuel thermodynamic and transport properties that were required in the heat transfer analysis. Results revealed drastic changes in the fuel flow properties and heat transfer characteristics when kerosene approached its critical state. Convective heat transfer enhancement was also found as kerosene became supercritical. The heat transfer correlation in the relatively low-fuel-temperature region yielded a similar result to other commonly used jet fuels, such as JP-7 and JP-8, at compressed liquid states. In the high-fuel-temperature region, near and beyond the critical temperature, heat transfer enhancement was observed; hence, the associated correlation showed a more significant Reynolds number dependency.

171 citations