Natural Convection Heat Transfer within Octagonal Enclosure
Publish Year: 1389
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_IJE-23-4_001
تاریخ نمایه سازی: 18 بهمن 1400
Abstract:
The problem of steady, laminar and incompressible natural convection flow in an octagonalenclosure was studied. In this investigation, two horizontal walls were maintained at a constant hightemperature, two vertical walls were kept at a constant low temperature and all inclined walls wereconsidered adiabatic. The enclosure was assumed to be filled with a Bousinessq fluid. The studyincludes computations for different Prandtl numbers Pr such as ۰.۷۱, ۷, ۲۰ and ۵۰ whereas the Rayleighnumber Ra was varied from ۱۰۳ to ۱۰۶. The pressure-velocity form of Navier-Stokes equations andenergy equation were used to represent the mass, momentum and energy conservations of the fluidmedium in the enclosure. The governing equations and boundary conditions were converted todimentionless form and solved numerically by penalty finite element method with discretization bytriangular mesh elements. Flow and heat transfer characteristics were presented in terms of streamlines,isotherms and average Nusselt number Nu. Results showed that the effect of Ra on the convection heattransfer phenomenon inside the enclosure was significant for all values of Pr studied (۰.۷۱-۵۰). It wasalso found that, Pr influence natural convection inside the enclosure at high Ra (Ra > ۱۰۴).
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Authors
M. D. Quamrul Islam
Mechanical Engineering, Bangladesh University of Engineering & Technology
Mohammad Nasim Hasan
Mechanical Engineering Department, Saga University
Sumon Saha
Mechanical Engineering, University of Melbourne
Goutam Saha
Mathematics, University of Dhaka