110
Conductances for Heat and Mass Transfer
References
Cowan, I.R. (1972) Mass and heat transfer in laminar boundary layers
with particular reference to assimilation and transpiration in leaves.
Agric. Meteor. lO:3 11-329.
deMichae1, D.W. and P.J.H. Sharp (1973) An analysis of the mechanics
of guard cell motion. J. Theor. Biol. 41:77-96.
Eckert, E.R.G. and R.M. Drake (1972) Analysis of Heat and Mass
Transfer New York: McGraw-Hill.
Garrat, J.R., and B.B. Hicks (1973) Momentum, heat, and water vapor
transfer to and from natural and artificial surfaces. Quart. J. Roy.
Meteor. Soc. 99:680487.
Jarman, P.D. (1974) The diffusion of carbon dioxide and water vapor
through stomata. J. Exp. Bot. 25927-936
Kowalski, G.J. and J.W. Mitchell (1975) Heat transfer from spheres in
the naturally turbulent, outdoor environment. Arner. Soc. Mech. Eng.
Paper No. 75-WAIHT-57
Kreith, F. (1965) Principles of Heat Transfer. Scranton, Pa.: International
Textbook Co.
Lumley, J.L., and H.A. Panofsky (1964) The structure of Atmospheric
Turbulence. New York: Wiley.
Mitchell, J.W. (1976). Heat transfer from spheres and other animal forms.
Biophysical Journal 1656 1-569.
Monteith, J.L., and G.S. Campbell (1980) Diffusion of water vapour
through integumentspotential confusion. J. Them. Biol. 5:7-9.
Monteith, J.L. arid M.H. Unsworth (1990) Principles of Environmental
Physics. 2nd ed. London: Edward Arnold.
Nobel, P.S. (1974) Boundary layers of air adjacent to cylinders Plant
Physiol. 54: 177-1 81.
Parkhurst, D.F., P.R. Duncan, D.M. Gates, and F. Kreith (1968) Wind
tunnel modeling of convection of heat between air and broad leaves
of plants Agric. Meteor. 5:33.
Patten, K.D., G.W Ape1 and M.E. Patterson (1988) Cuticular diffusive
resistance measurements: A technique for teaching and research in
postharvest research in horticulture. Dept. of Horticulture, Wash.
State Univ., Pullman, WA.
Yasuda, N. (1988) Turbulent difisivity and diurnal variations in the atmospheric boundary layer. Boundary-Layer Meteorol. 43:20%221.
Problems
7.1. Maximum width of a leaf in the direction of wind flow is 5 cm. Leaf
temperature is 20" C in a 1 m/s wind when T, = 15" C. Find d, Re,
Gr , g ~ , , and H. Is heat transfer mainly by forced or free convection?
7.2. The wind speed at a height of 2 m is 5.6 m/s. Find the boundary layer
(turbulent transport) conductance for a potato canopy that is 50 cm
high. Assume neutral stability.
Conductances for Heat and Mass Transfer
References
Cowan, I.R. (1972) Mass and heat transfer in laminar boundary layers
with particular reference to assimilation and transpiration in leaves.
Agric. Meteor. lO:3 11-329.
deMichae1, D.W. and P.J.H. Sharp (1973) An analysis of the mechanics
of guard cell motion. J. Theor. Biol. 41:77-96.
Eckert, E.R.G. and R.M. Drake (1972) Analysis of Heat and Mass
Transfer New York: McGraw-Hill.
Garrat, J.R., and B.B. Hicks (1973) Momentum, heat, and water vapor
transfer to and from natural and artificial surfaces. Quart. J. Roy.
Meteor. Soc. 99:680487.
Jarman, P.D. (1974) The diffusion of carbon dioxide and water vapor
through stomata. J. Exp. Bot. 25927-936
Kowalski, G.J. and J.W. Mitchell (1975) Heat transfer from spheres in
the naturally turbulent, outdoor environment. Arner. Soc. Mech. Eng.
Paper No. 75-WAIHT-57
Kreith, F. (1965) Principles of Heat Transfer. Scranton, Pa.: International
Textbook Co.
Lumley, J.L., and H.A. Panofsky (1964) The structure of Atmospheric
Turbulence. New York: Wiley.
Mitchell, J.W. (1976). Heat transfer from spheres and other animal forms.
Biophysical Journal 1656 1-569.
Monteith, J.L., and G.S. Campbell (1980) Diffusion of water vapour
through integumentspotential confusion. J. Them. Biol. 5:7-9.
Monteith, J.L. arid M.H. Unsworth (1990) Principles of Environmental
Physics. 2nd ed. London: Edward Arnold.
Nobel, P.S. (1974) Boundary layers of air adjacent to cylinders Plant
Physiol. 54: 177-1 81.
Parkhurst, D.F., P.R. Duncan, D.M. Gates, and F. Kreith (1968) Wind
tunnel modeling of convection of heat between air and broad leaves
of plants Agric. Meteor. 5:33.
Patten, K.D., G.W Ape1 and M.E. Patterson (1988) Cuticular diffusive
resistance measurements: A technique for teaching and research in
postharvest research in horticulture. Dept. of Horticulture, Wash.
State Univ., Pullman, WA.
Yasuda, N. (1988) Turbulent difisivity and diurnal variations in the atmospheric boundary layer. Boundary-Layer Meteorol. 43:20%221.
Problems
7.1. Maximum width of a leaf in the direction of wind flow is 5 cm. Leaf
temperature is 20" C in a 1 m/s wind when T, = 15" C. Find d, Re,
Gr , g ~ , , and H. Is heat transfer mainly by forced or free convection?
7.2. The wind speed at a height of 2 m is 5.6 m/s. Find the boundary layer
(turbulent transport) conductance for a potato canopy that is 50 cm
high. Assume neutral stability.