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		题名	作者	年代	出处	被引量
	1	Axially Oriented Structured Porous Layers for Heat Transfer Enhancement in a Solar Receiver Tube显示文摘The present work reports a numerical investigation of heat transfer and pressure drop characteristics in a solar receiver tube with different shaped porous media for laminar and low Reynolds number turbulent flow regimes.Numerical simulations have been performed with finite volume-based code ANSYS(v-2017)for different shapes of porous layers axially oriented in the tube.The plain-shaped porous medium fitted up to 50%of the tube shows better performance than other-shaped porous layers.Simulations have also been performed for axially oriented structured porous media with different sizes.Axially oriented structured porous medium develops a lateral flow disturbance enhancing the intermixing of the liquid and porous medium at their interface.Structured porous medium with a 3-crest configuration shows the best heat transfer performance among all the shapes of porous media.It offers a maximum of 148%heat transfer enhancement compared to a half-filled plain porous layer,whereas it reports a maximum of 564%enhancement compared to the flow without a porous layer.The lateral flow tendency or the swirling effect helps better heat transfer performance in the axially oriented structured porous media.Performance evaluation criterion(PEC)in all types of porous media is more in the transitional flow regime than in the laminar and turbulent flow regimes.For the same operating conditions,the maximum value of the PEC in the present work is 120%higher than the maximum value of PEC for other-shaped porous media reported in the literature.Correlations for Nusselt number have been developed for both laminar and turbulent flow regimes for three crests shaped porous medium.	DAS Shefali VERMA Neha PATHAK Manabendra BHATTACHARYYA Suvanjan	2021	Journal of Thermal Science2021，30，5：	0
	2	Combustion Characteristics of Coal Mine Methane in a Preheated-Burner Packed with Raschig Rings显示文摘The utilization of coal mine methane(CMM)through porous medium combustion(PMC)contributes to energy saving and environmental protection.In this paper,a double-layer porous medium burner with the combination of heat exchangers was designed to recycle the exhausted heat for preheating the inlet gas.The effects of Raschig ring sizes on the temperature distributions and pollutant emissions were studied under different operating conditions.The results indicate that the preheating of inlet gas greatly influenced the temperature distribution and the optimum preheating effect was shown in the burner of spiral heat exchanger together with lower pollutant emissions.With the increasing of inlet velocity and equivalence ratio,the peak temperature was increased significantly.As the Raschig ring size increased,the flame temperature increased first and then decreased gradually.Meanwhile,the highest temperature and lowest average emissions of NOx and CO appeared in the burner of 10 mm Raschig rings.This study will provide the CMM utilization engineering with the theoretical foundation on PMC.	DAI Huaming ZHU Huiwei YANG Pan DAI Hongchao HE Song WANG Zhiqiang	2021	Journal of Thermal Science2021，30，5：	0

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