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Boundary-Layer Meteorology

, Volume 3, Issue 4, pp 454–467 | Cite as

Model experiments on free-convection heat and mass transfer of leaves and plant elements

  • P. H. Schuepp
Article

Abstract

Effects of orientation, shape, and surface structure on the free convection mass transfer of plates, leaf- and plant-models were studied in an electrolytic system. The results were extrapolated to the transfer of heat and mass in air, in an effort to predict realistic boundary-layer transfer coefficients for leaves and plant-like surfaces. Flow visualization complemented the investigation.

The results indicate that increases in transfer of 50% over that of a vertical plate are possible for non-vertical rough leaves, but that a 25% increase is a more reasonable estimate for an ‘average plant’. Evidence is also presented that more reliable caluclations of the transfer properties of pine needles are obtained if the needles are approximated by vertical cylinders, rather than by horizontal ones.

Keywords

Convection Mass Transfer Model Experiment Transfer Coefficient Surface Structure 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Fosworth, R. C. L.: 1952,Heat Transfer Phenomena, John Wiley.Google Scholar
  2. Bouad, M. G. and Ibl, N.: 1960, ‘Natural Convection Mass Transfer at Vertical Electrodes under Turbulent Flow Conditions’,Electrochim. Acta 3, 233–243.Google Scholar
  3. Gates, D. M., Tibbals, E. C., and Kreith, F.: 1965, ‘Radiation and Convection for Ponderosa Pine’,Amer. J. Bot. 52, 66–71.Google Scholar
  4. Husar, R. B. and Sparrow, E. M.: 1968, ‘Patterns of Free Convection Flow Adjacent to Horizontal Heated Surfaces’,Int. J. Heat Mass Transfer 11, 1206–1208.Google Scholar
  5. Ibl, N.: 1961, ‘Probleme des konvektiven Stoffaustausches bei der Elektrolyse’,Chem. Ingr. Tech. 33, 69–74.Google Scholar
  6. Kreith, F.: 1965,Principles of Heat Transfer, 2nd ed., Intern. Textbook Co.Google Scholar
  7. Kumar, A. and Barthakur, N.: 1971, ‘Convective Heat Transfer Measurements of Plants in a Wind Tunnel’,Boundary-Layer Meteorol. 2, 218–227.Google Scholar
  8. Levich, V. G.: 1962,Physiochemical Hydrodynamics, Prentice-Hall.Google Scholar
  9. Mueller, A. C. and Jakob, M.: see Jakob, M.: 1964,Heat Transfer, John Wiley.Google Scholar
  10. Parkhurst, D. F.: 1968, ‘Convective Transport in the Leaf-Air Interface: Some Refinements to the Theory, and an Ecological Application’, M. S. Thesis, Botany Dept., University of Wisconsin.Google Scholar
  11. Parkhurst, D. F., Duncan, P. R., Gates, D. M., and Kreith, F.: 1968, ‘Wind-Tunnel Modelling of Convection between Air and Broad Leaves of Plants’,Agr. Meteorol. 5, 33–47.Google Scholar
  12. Parlange, J. V., Waggoner, P. E., and Heichel, G. H.: 1971, ‘Boundary Layer Resistance and Temperature Distribution on Still and Flapping Leaves’,Plant Physiol. 48, 437–442.Google Scholar
  13. Pearman, G. I., Weaver, H. L., and Tanner, C. B.: 1971, ‘Boundary Layer Heat Transport Coefficients under Field Conditions’, submitted toAgr. Meteorol. Google Scholar
  14. Ravoo, E., Rotte, J. W., and Sevenstern, F. W.: 1970, ‘Theoretical and Electrochemical Investigation of Free Convection Mass Transfer at Vertical Cylinders’,Chem. Engng. Sci. 25, 1637–1652.Google Scholar
  15. Saville, D. A. and Churchill, S. W.: 1970, ‘Simultaneous Heat and Mass Transfer in Free Convection Boundary Layers’,A ICHE J. 16, 268–273.Google Scholar
  16. Schlichting, H.: 1968,Boundary Layer Theory, McGraw Hill.Google Scholar
  17. Schuepp, P. H.: 1972, ‘Studies of Forced-Convection Heat and Mass Transfer of Fluttering Realistic Leaf Models’,Boundary-Layer Meteorol. 2, 263–274.Google Scholar
  18. Schuetz, G.: 1963, ‘Natural Convection Mass-Transfer Measurements on Spheres and Horizontal Cylinders by an Electrochemical Method.’,Int. J. Heat Mass Transfer 6, 873–879.Google Scholar
  19. Senftleben, H.: 1951, ‘Die Waermeabgabe von Koerpern verschiedener Form in Fluessigkeiten und Gasen bei freier Stroemung,Z. Angew. Phys. 3, 361–373.Google Scholar
  20. Tobias, C. W., Wilke, C. R., and Eisenberg, M.: 1952, ‘Diffusion and Convection in Electrolysis - a Theoretical Review’,J. Electrochem. Soc. 99, 359–365.Google Scholar
  21. Van Leeuwen, J. H., Looman, C. M., and Schenk, J.: 1971, ‘Experimental Study of Velocity and Temperature Distribution for Free Convection in a Corner’,Int. J. Heat Mass Transfer 14, 561–564.Google Scholar
  22. Wragg, A. A. and Loomba, R. P.: 1970, ‘Free Convection Flow Patterns at Horizontal Surfaces with Ionic Mass Transfer’,Int. J. Heat Mass Transfer13, 439–442.Google Scholar

Copyright information

© D. Reidel Publishing Company 1973

Authors and Affiliations

  • P. H. Schuepp
    • 1
  1. 1.Macdonald Campus of McGill UniversityQue.Canada

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