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HETAV PATEL

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a motor cycle cylinder consists of 10 fins ; each 15 cm outside diameter and inside diameter 7.5 cms. calculate rate of heat dissipation from cylinder fins when (i) motorcycle is stationary (ii) motorcycle is running at 60 km/hr. atmospheric air is at 20 degree celsius and avg fin temip is 480 celsius. the relevant thermo-physical properties at avg tem of 250 celsius are density = 0.674 kg/m^3 SPECIFIC HEAT = 1038 J/Kg K thermal conductivity k = 0.427 prandtl no. Pr = 0.677 kinematic viscosity v = 40.61 X 10^(-6) meter square/s B coefficient of cubical expanson = 1.912 X 10^(-3) per degree kelvin Approx value of heat transfer coefficient may be evaluated by idealing the fins as single horizontal flate plate of same area . use significant length l = 0.9 d Nu = 0.54 ( Gr Pr)^ (0.25) for laminar flow Nu = 0.036 (Re)^(0.8) X (Pr)^(0.33) for turbulent flow where Nu nussel no. Gr grashof no. Pr prandtl no. Re REYNOLDS NO. plz solve the problem urgently. i have exam tomorrow


a motor cycle cylinder consists of 10 fins ; each 15 cm outside diameter and inside diameter 7.5 cms. calculate rate of heat dissipation from cylinder fins when
(i) motorcycle is stationary
(ii) motorcycle is running at 60 km/hr.

atmospheric air is at 20 degree celsius and avg fin temip is 480 celsius. the relevant thermo-physical properties at avg tem of 250 celsius are
density = 0.674 kg/m^3 SPECIFIC HEAT = 1038 J/Kg K
thermal conductivity k = 0.427

prandtl no. Pr = 0.677

kinematic viscosity v = 40.61 X 10^(-6) meter square/s

B coefficient of cubical expanson = 1.912 X 10^(-3) per degree kelvin

Approx value of heat transfer coefficient may be evaluated by idealing the fins as single horizontal flate plate of same area . use significant length l = 0.9 d

Nu = 0.54 ( Gr Pr)^ (0.25) for laminar flow
Nu = 0.036 (Re)^(0.8) X (Pr)^(0.33) for turbulent flow

where Nu nussel no. Gr grashof no. Pr prandtl no. Re REYNOLDS NO.



plz solve the problem urgently. i have exam tomorrow


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