By Samuel Seely
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In radiant heat transfer thermal energy flows from a region of high tempera ture to one of lower temperature by an electromagnetic radiation process. 672 x 10"8 Joules/irf-sec-deg4, e = emissivity of the surface (ranges between 0 and 1). This is a fourth power flow law between the through variable and the across variable, as against the square-root relation for turbulent flow, and the linear relation for electric current. The thermal resistance for radiation is written, R = M = 4di8} (deg-sec/Joule) (1-76) where 6a = average of radiator and receiver temperatures.
1-13 THE SPRING A spring element is one which stores energy in the displacement due to the elastic deformation that results from the application of a force. The terminal properties of the spring are shown graphically in Fig. 1-26. Here Elastic energy U = j fdx Elastic coenergy U' = fxdf f Fig. 1-26. Force-displacement relationship for a spring. we show the displacement-force relationship to be nonlinear, which is the general case. For the region where the curve is linear, the analytic expres sion is written, f=Kx (Newtons) (1-35) where K is the spring constant.
The force necessary to accelerate the mass in the pipe (pAl) is given by, / = A(h2-hl) = pAlff. But the flow rate Q = Av, so that, h2 — hi = p[dQ_rdQ L ^ A dt where the quantity L is the fluid inductance. (1-61) Gas Systems 43 A fluid source must comprise two parts —a reservoir (sump) of the liquid and a pump for causing the liquid to flow under some sort of pres sure. A large variety of fluid pumps are available. We refer specifically to gear pumps and centrifugal pumps. The design and operation of the gear pumps is such that liquid is provided at a relatively constant flow rate against a wide range of heads.