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Natural convection from leaves at realistic Grashof numbers
Author(s) -
DIXON MICHAEL,
GRACE JOHN
Publication year - 1983
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/1365-3040.ep11589240
Subject(s) - grashof number , natural convection , convection , boundary layer , thermodynamics , mechanics , chemistry , environmental science , physics , reynolds number , nusselt number , turbulence
. The boundary layer resistance of model leaves was measured in still air, at a range of leaf‐to‐air temperature differences. The results were compared to those calculated from standard formulae for natural convection. The agreement between observed and calculated was only satisfactory when Grashof numbers exceeded about 105. At the lower Grashof numbers, which often prevail in nature, the observed rates of heat transfer considerably exceeded those calculated.