Numerical Prediction of Fluid Flow and Heat Transfer in a Wavy Pipe

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	Numerical Prediction of Fluid Flow and Heat Transfer in a Wavy Pipe
	Shohel Mahmud; A.K.M. Sadrul Islam; Prodip Kumar Das
刊名	JOURNAL OF THERMAL SCIENCE
	2001
卷号	10 期号:2 页码:133138
关键词	Nusselt Number Separation Bubble Surface Waviness Wall Vorticity
英文摘要	Hydrodynamic and thermal characteristics in a pipe with sinusoidal wavy surface for steady laminar flow are investigated numerically in the present study. The integral forms of governing equations are discretized using control volume based Finite Volume method with collocated variable arrangement. SIMPLE algorithm is used and TDMA solver is applied for solution of system of equations. A pipe of length equal to 4λ is considered. Effect of surface waviness, determined by wavelength-amplitude ratio λ/a (=L), on flow and thermal field is presented. The simulation work has been carried out for L=11.0−30.0 for a Reynolds number range 50 to 2000. Results are presented in the form of streamfunction, isothermal lines, velocity and vorticity profiles, change of mean friction factor, variation in skin friction, local and average Nusselt number with Reynolds number, wave number (n) and L. For a particular geometry, length of circulation zone increases with Reynolds number and approaches a limiting value for higher Reynolds number. Wall shear stress in the bulge part of the channel shows smaller values that affect largely the rate of heat transfer and Nusselt number shows minimum values in this region. This circulation zone drastically increases with the increase of surface waviness showing high mean friction factor per wavelength. Mean friction factor inversely varies with Reynolds number. A correlation is proposed for calculating friction factor in the form f=C/(Re)m, where ‘C’ and ‘m’ represents two polynomials of degree 4 and 2 respectively and are function of L. Higher waviness of the surface shows the higher heat transfer rate than lower waviness. Heat transfer rate falls almost exponentially along the axial direction with the increase of wave number.
公开日期	2013-03-12
内容类型	期刊论文
源URL	[http://ir.etp.ac.cn/handle/311046/53678]
专题	工程热物理研究所_Journal of Thermal Science
推荐引用方式 GB/T 7714	Shohel Mahmud,A.K.M. Sadrul Islam,Prodip Kumar Das. Numerical Prediction of Fluid Flow and Heat Transfer in a Wavy Pipe[J]. JOURNAL OF THERMAL SCIENCE,2001,10(2):133138.
APA	Shohel Mahmud,A.K.M. Sadrul Islam,&Prodip Kumar Das.(2001).Numerical Prediction of Fluid Flow and Heat Transfer in a Wavy Pipe.JOURNAL OF THERMAL SCIENCE,10(2),133138.
MLA	Shohel Mahmud,et al."Numerical Prediction of Fluid Flow and Heat Transfer in a Wavy Pipe".JOURNAL OF THERMAL SCIENCE 10.2(2001):133138.