Gerhard Lang's Arado Ar 240 PDF

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Maxwell's Definition of Viscosity The following example is instructive from several points of view. are separated from one A number of layers of air, each of thickness h t another by a series of infinite horizontal plates. Alternate plates are fixed, while the others are given a common velocity U in their own The resulting conditions in all layers will be the same planes. for a question of sign, and we shall investigate one layer except fc only. Draw Ox (Fig. 10) in the fixed plate (taken to be the lower one) u=U y u U-O tr FIG.

The gas then expands according to the adiabatic law : rP Distinguishing properties 1-405: = const. by accented symbols, we have, since Y= r,/x 0-288 / T, 3 = (P*\ (p'J = Now assume that initially r( TJ. Very closely, Since p* < p lf we then have that -ri < T 2 P*pz Article 16 the gas-bag will sink, the load attached to = pl = p( and Hence, by it being constant. Conversely, a rapid descent of a gas-bag results in temporary excessive buoyancy. Thus a lighter-than-air craft riding below its static ceiling tends to .

Motion at constant velocity = 0, 2 . . = (63) u = . , . = 2Cy, v = 0, and we recognise the flow as including that of FLOW AND AERODYNAMIC FORCE AIR n] 24, where 2C = U/h, and there are certain restrictions on the area occupied by Article 49 y/c*6 y/os Wo* the flow. y/c=3 39. Circulation and Vorticity So far we have dealt with the line integral of the normal velocity component across a drawn in the field of The line integral of the tangential velocity component once round any closed curve is curve flow.

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