By C. W. Rose, W. Ashhurst and H. T. Flint (Auth.)
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Extra resources for Agricultural Physics
Arrows indicate direction of motion. air in a direction normal to the flow. It is due to one layer of air tending to move adjacent layers with it because of the shear stress between them. But what is the origin of these shear stresses ? It is a consequence of the molecular structure of the fluid and may be more readily understood in terms of the following analogy. Figure 17 represents PHYSICAL ENVIRONMENT OF AGRICULTURE 45 a view from above of two crowded streams of people rushing in opposite directions.
87, 171 (1961). 16. SWINBANK, W. C , Long-wave radiation from clear skies, Quart. J. R. Met. Soc. 89, 339 (1963). 17. , Notes on radiation in the atmosphere, I, Quart. J. R. Met. Soc. 58, 389 (1932). 18. PENMAN, H. , Natural evaporation from open water, bare soil, and grass, Proc. Roy. Soc. Series A, 193, 120 (1948). 19. GIOVANELLI, R. , An omnidirectional photometer of small dimensions, / . Sei. Instrum. 30,326 (1953). 20. FUNK, J. , Improved polythene-shielded net radiometer, / . Sei. Instrum.
3) to heat conduction in soils is the variation in κ with depth and time, due to differences in moisture content and porosity, and to moisture movement. Mass movement of moisture completely invalidates the application of eqn. 3), since it was assumed in its derivation that heat transfer was by thermal conduction alone. The bodily movement of water through soil can transfer appreciable quantities of heat with it, and in soils with sufficient large pores to allow rapid flow of water this mechanism of heat transfer can swamp that due to thermal conduction.