Download PDF by C. W. Rose, W. Ashhurst and H. T. Flint (Auth.): Agricultural Physics

By C. W. Rose, W. Ashhurst and H. T. Flint (Auth.)

ISBN-10: 0080118844

ISBN-13: 9780080118840

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Conservation considerations for the rectangular volume of air shown in Fig. 12) where (dC/dt) is the change per unit period in the conservative quantity stored within the volume whose vertical and horizontal fluxes are denoted by F and H. The storage term C obtained on integrating eqn. 12) is very small compared with the total flow per unit area such as fF0dt. Since the fluxes (of water vapour or heat energy, for example) in all but deep layers of air are large compared with storage changes, the term (dCjdt) in eqn.

Thus from eqn. 6) velocity gradients must be considerable before viscous shear stresses become appreciable. Such high gradients are found only in proximity to solid surfaces. It is a fact of great significance that the velocity gradient in the situation illustrated by Fig. 16b, for example, decreases extremely rapidly with distance from the surface. Thus, as Prandtl first made clear in 1904, viscosity has virtually no direct influence on flow outside a very thin layer of air (usually only of the order of a millimetre thick for limited surfaces) adjacent to any solid surface.

3, the microclimate in which plants grow is dominated by the magnitude of RN, and the components of "sensible" and "latent" heats into which this is partitioned. 3 as the flux difference between solar and sky radiation absorbed and net long-wave radiation emitted. Symbolically [eqn. 9) again] : RN = Rs(l - p) - RL. 1) This describes the energy input (during daytime) or output (during hours of darkness) as the resultant of all the radiative fluxes to and from the ground surface. Figure 10 gives a typical record of the variation of net and global radiation during a day and a night.

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Agricultural Physics by C. W. Rose, W. Ashhurst and H. T. Flint (Auth.)


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