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Document Type |
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Article In Journal |
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Document Title |
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Laminar Natural Convection in a Square Enclosure with Discrete Heating of Vertical Walls انتقال الحرارة بالحمل الحر الانسيابي في حيز مربع عند تسخين جزئي لجدران عمودية |
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Subject |
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Mechanical Engineering |
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Document Language |
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English |
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Abstract |
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Natural convection heat transfer in a square air-filled enclosure
with one discrete flush heater is examined numerically. The enclosure
is vertical with isothermal heating strip on one wall, the remainder
of the wall and the opposing one are isothermally maintained at a lower
temperature. The top and bottom sides are adiabatic. The two dimensional
differential conservation equations of mass, momentum and energy
are solved by a finite difference method for Rayleigh number varying
from 102 to 106. The changes in temperature and flow fields
(stream functions) with increase in Rayleigh number are investigated
for different heater locations. The isothermal cold sections adjacent to
the heater assist the development of secondary circulation cells, that depend
upon both Rayleigh number and the position. With discrete heating
and cooling sections on one wall, the flow is characterized by boundary
layers lining these sections with separate circulation cells. The
variation of the local Nusselt number is influenced by this flow pattern
and the average Nusselt number is higher than that of a discrete heating
strip mounted on an adiabatic wall. The optimum location over the
range of Rayleigh number is for the heater mounted at the center of the
wall, s/L = 0.5 a result confirmed by previous experiments. |
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ISSN |
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1319-1047 |
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Journal Name |
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Engineering Sciences Journal |
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Volume |
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12 |
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Issue Number |
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2 |
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Publishing Year |
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1420 AH
2000 AD |
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Number Of Pages |
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16 |
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Article Type |
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Article |
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Added Date |
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Sunday, October 11, 2009 |
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