Natural convection through rectangular openings in partitions. Pt. 2. Horizontal partitions

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TypeArticle
Journal titleInternational Journal of Heat and Mass Transfer
ISSN0017-9310
Volume5
Pages869881; # of pages: 13
Subjectconvection; partitions; openings; thermal resistance
AbstractNatural convection through square openings in a horizontal partition for the case of heavier fluid above the partition is investigated using air as the fluid medium. The test results relating the Nusselt number to the Grashof number and to the ratio of opening thickness to opening width are found to agree generally with the requirements of theory. Although the Prandtl number for air remained constant in all tests, it was nevertheless possible, with the help of the theory, to show the approximate influence to be expected for any value of the Prandtl number. Because of the high thermal resistance of the partition material the test results may also be expected to apply directly to mass transfer. The following range of variables was covered in the tests: Grashof number Gr(H) based on partition thickness and air temperature difference across the opening, 3 X 10(4) less than Gr(H) less than 4 X 10(7); ratio of partition thickness to the side of the square opening H/L, 0.0825 less than H/L less than 0.66, with openings of 6 X 6 in, 9 X 9 in and 12 X 12 in.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
IdentifierDBR-RP-170
NRC number6954
1298
NPARC number20386139
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Record identifier19035b3f-8317-4c52-a62f-4ee2daa24e93
Record created2012-07-25
Record modified2016-05-09
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