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Example text

It is evident that a pitch of t/d ¼ 6 will always result in a pronounced maximum. In Fig. 9, the average Nusselt number is shown as a function of the relative nozzle distance with the pitch as a parameter. The profiles for both the in-line and staggered arrangements are shown. The Nusselt numbers are approximately constant up to a relative nozzle distance of about five, and then decrease continuously. When considering the profiles of the average Nusselt number, no significant difference can be seen between the in-line and staggered arrangements.

With the reference condition P0, T0, for example, P0 ¼ 1 bar, T0 ¼ 373 K. The minimum required energy is the enthalpy of vaporization of the water _v¼m _ v D hv : H ð1:8Þ 3 4 1 Impinging Jet Drying _ 0 related to the The specific drying energy is the energy for heating the air H enthalpy of evaporation. From the above equations results   _ v D hv m 2   þ T pd r c w À T P S a 0 _0 pd2 r0 cP w 1 TS À Ta H a : ð1:9Þ ¼ ¼ þ _v _ v D hv _ v D hv 4t2 m 4t2 a m H The enthalpy to heat up the dry material was omitted for clarity purposes.

At the outer edge of the emerging jet, circular vortices form. In the deflection region at r/d % 1, a large vortex forms but this disintegrates at approximately r/d % 2 into many small vortices. , 2003, for photographs of the visualized flow). Increasing the nozzle distance from the stagnation point decreases the velocity, which in turn results in a decrease of the heat transfer coefficient. A completely laminar flow only occurs at Reynolds numbers smaller than 50; however, such small Reynolds numbers possess no meaning for technical heat-transfer processes.

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