need it quickly please A water jacket cools the cylinder of an engine. Water tem

Question

need it quickly please

A water jacket cools the cylinder of an engine. Water temperature can be taken as 87 degree C. Heat flux from the hot combustion gas to the inside surface of the cylinder is estimated at 1000 W/m2. The cylinder wall inside radius is 70mm and the wall thickness is 5 mm. The cylinder is 100 mm tall. Thermal conductivity of the cylinder wall is 40 W/(mK). If we want the cylinder inside wall temperature to be 90 degree C, what should be the heat transfer coefficient between water flow and the outside surface of the cylinder?

Explanation / Answer

For a cylinder ,

Heat flux=4pi*K*r1*r2(T2-T1)/(r2-r1) so substituting the values we get

1583.36*coeff=1000,hence the answer=0.63156

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