THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

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Muhammad Ashraf

,

Robina Yasmeen

,

Masud Ahmad

THERMAL RADIATION MIXED CONVECTION BOUNDARY LAYER FLOW IN TIGHTLY COILED CURVED PIPE FOR LARGE RICHARDSON NUMBER

ABSTRACT
The characteristics of radiative mixed convection boundary layer flow generated close to the inner walls of tightly coiled curved pipe for full range of Richardson number λ is investigated. In order to find numerical solutions the governing coupled, nonlinear partial differential equations are transformed into convenient form for integration by using Primitive Variable Formulation. From this transformation the terms highest powers of Dean Number (D=δ1/2Re)are retained into boundary layer form and then solved numerically by using Finite Difference Method. Expressions for the axial and transverse components of skin friction, heat transfer coefficient and flux thicknesses for various values of Richardson Number λ, angle α, curvature of the pipe (tightly coiled pipe in which 0<δ<1), Plank Number Rd and Prandtl Number Pr are obtained and given graphically.
KEYWORDS
coiled curved pipe, mixed convection, thermal radiation, Dean number, curvature, finite difference method
PAPER SUBMITTED: 2015-08-05
PAPER REVISED: 2016-05-17
PAPER ACCEPTED: 2016-05-17
PUBLISHED ONLINE: 2016-05-30
DOI REFERENCE: https://doi.org/10.2298/TSCI150805120A
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2018, VOLUME 22, ISSUE Issue 1, PAGES [147 - 156]
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Thermal radiation mixed convection boundary layer flow in tightly coiled curved pipe for large Richardson number

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence