heat transfer UNIVERSITY OF BAHRAIN College of Engineering M

heat transfer

UNIVERSITY OF BAHRAIN College of Engineering Mechanical Engineering Department MENGi 335: HEAT TRANSFER Quiz#4 14 April 2015 number Question (50 points) A borisoetal long cylindrical pipe with outer diameter 1m is made of alumimm (k-237WimK). The pipe bas an ouside surfave temperature of 163 C.It is cocled using 23\'C air at 0.616 m\'s velocity, in three different air fow directions in accordance with the earth gravity (-9.87 m\'s) are shown in the figure below T 3200 Air velocity is perpendiealar Air velocity is perpendicular Air vekcity and the gravity Ai vekoelty and to the gravity veclor. vector are parallel. the gravity vector her coolant rate? Justify your ang the mumerical ri ini these cooling 1 1 a) Which air flow configuration will result in a hi answer by showing b) What are the Peclet sumbers for these flow configurations? Explain Take the air properties as below (Tr-367K) k 0.0313 W/mk a-32.8x 10-6 rnas Pr0.69 B-2.725x10K

Solution

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