Natural Convection in an Enclosure with a Discretely Heated Sidewall: Heatlines and Flow Visualization

Natural convection inside a rectangular enclosure is investigated experimentally and numerically. One of the sidewalls is heated discretely by two flush-mounted heat sources. The other sidewall is kept at a constant temperature, while the horizontal walls are unheated. Heat dissipation rates of the...

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Bibliographic Details
Published in:Journal of Applied Fluid Mechanics 2018-01, Vol.11 (1), p.271-284
Main Authors: Saglam, M., Sarper, B., Aydin, O.
Format: Article
Language:English
Subjects:
Aspect ratio
Conduction heating
Convection
Convective heat transfer
Enclosures
Flow visualization
Free convection
Heat
Heat sources
Heat transfer
Natural convection
Electronics cooling
Rectangular enclosure
Discrete heating
Surface radiation
Conjugate
Flow visualization
Heatlines
Radiation
Rayleigh number
Surface temperature
Visualization
Working fluids
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Summary:Natural convection inside a rectangular enclosure is investigated experimentally and numerically. One of the sidewalls is heated discretely by two flush-mounted heat sources. The other sidewall is kept at a constant temperature, while the horizontal walls are unheated. Heat dissipation rates of the heat sources are equal to each other. The aspect ratio of the enclosure (AR) is 2 and the working fluid is air (Pr=0.71). The study is focused on the validation of the two and three dimensional computations under real test conditions against experiments for various modified Rayleigh number values. Experimental study is performed for various modified Rayleigh numbers in the range of 7.7x105 and 3.1x106 while numerical part covers the values between 104 and 5x106. Temperature measurements and flow visualization studies are performed in the experimental work, and streamlines, isotherms and heatlines are presented in the numerical part of the study. From the experimental and numerical studies, it is shown that two dimensional computations reflects the general characteristics of the problem, conduction and radiation heat transfer are not negligible, surface temperatures increase with the modified Rayleigh number and heatline approach is an important tool to analyze convective heat transfer.
ISSN:1735-3572
1735-3645
DOI:10.29252/jafm.11.01.28167