Effect of the sliding friction on heat transfer in high-speed rarefied gas flow simulations in CFD

 http://repository.vnu.edu.vn/handle/VNU_123/26279

Different nature of the heat transfer computation between the CFD and DSMC methods in rarefied gas flow simulations leads to the difference of their heat transfer results. 

This paper will revisit a formulation of heat transfer in CFD that includes the sliding friction part for a planar surface.

The sliding friction was first introduced by Maslen, and used to be omitted in calculating the CFD heat transfer.

This formulation will be extended to compute the heat transfer over the curved surfaces such as NACA0012 micro-airfoil and the sharp 25e55-deg. biconic.

Two these configurations 1) NACA0012 micro-airfoil (M¼2) with various Kn¼0.026, 0.1 and 0.26 with the angles-of-attack from 0-deg. to 20-deg., and a sharp 25e55-deg. biconic (M¼15.6) are simulated by the CFD method, which solves the Navier-Stokes equations within the OpenFOAM framework.

Moreover, theflat plat cases with various wall temperatures (Tw¼77 K and 294 K) are also undertaken to investigate the significance of the sliding friction on the heat transfer.

The CFD simulation results of the heat transfer involving the sliding friction give good agreements with the DSMC data, especially the NACA0012 micro-airfoil cases with high Knudsen numbers Kn¼0.1 and 0.26.

Title:	Effect of the sliding friction on heat transfer in high-speed rarefied gas flow simulations in CFD
Authors:	Le, Nam T. P. Vu, Ngoc Anh Le, Tan Loc
Keywords:	Sliding friction Heat transfer Surface gas temperature Biconic
Issue Date:	2016
Publisher:	H. : ĐHQGHN
Citation:	ISIKNOWLEDGE
Abstract:	Different nature of the heat transfer computation between the CFD and DSMC methods in rarefied gas flow simulations leads to the difference of their heat transfer results. This paper will revisit a formulation of heat transfer in CFD that includes the sliding friction part for a planar surface. The sliding friction was first introduced by Maslen, and used to be omitted in calculating the CFD heat transfer. This formulation will be extended to compute the heat transfer over the curved surfaces such as NACA0012 micro-airfoil and the sharp 25e55-deg. biconic. Two these configurations 1) NACA0012 micro-airfoil (M¼2) with various Kn¼0.026, 0.1 and 0.26 with the angles-of-attack from 0-deg. to 20-deg., and a sharp 25e55-deg. biconic (M¼15.6) are simulated by the CFD method, which solves the Navier-Stokes equations within the OpenFOAM framework. Moreover, theflat plat cases with various wall temperatures (Tw¼77 K and 294 K) are also undertaken to investigate the significance of the sliding friction on the heat transfer. The CFD simulation results of the heat transfer involving the sliding friction give good agreements with the DSMC data, especially the NACA0012 micro-airfoil cases with high Knudsen numbers Kn¼0.1 and 0.26.
Description:	INTERNATIONAL JOURNAL OF THERMAL SCIENCES Volume: 109 Pages: 334-341 ; TNS06336
URI:	http://repository.vnu.edu.vn/handle/VNU_123/26279
Appears in Collections:	Bài báo của ĐHQGHN trong Web of Science