Question

In terms of qo , sphere radius ro, surrounding convection coefficient h, surrounding temperature T... P4: 20% What is the amount of radiant power leaving the opening of a cylindrical cavity with the diameter of 16 mm and depth of 24 mm with the emissivity of .9 and temperature of 1200 K. The surrounding temperature is 300 K. P5: 10%

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Answer:

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Answer: Az gumm AI, Ei=19 TF1200k the Radiant power leaving ? opening? ginen dia 16mm , depth =24mm 9 Making the thermal araut diagran J2 Eba mm -92 black * * qi . Assumptions! oso is a Hypotheti thetical surface A2 body at ok 3ook as ginen (suroruding Cauity surface is iso thermal opaque and diffuse gray Analysis as Az is blackbody all the nadiation incident on A2 from the cavity results from and escape so it tells that to the emmison the wall by PENPIA

Surroundings, it follows that it follows that for A2, E2 = 1 tba=074 Fal=t, and ALF12 = A 2 f1 SO AIZ AD t ID2= H ND (+4) +.024) = TX *016 x .016 +: H Ai 14.06x10 4 m2 AD A X 6016) ? 니 H 4 = 2 x 10 exio m2 Now we can write q = (Eb, Eb2 -G It + t I-E2 EIAI AIF2 E2 A2 4 (514-72 1,4V 1-19 +1+ •98 14.068104 2X10 4 ERAZ as Alf2 = Azhar AIF2 = A2