A tube is subjected to air at standard temperature and pressure conditions with velocity 5 m/s. initial temperature of the tube is 980 K and drops to 500 K after interaction with the cool air. Radius of the tube is 16 cm and density and heat capacity of the material of construction is 7555 ib/ft3 and 269 btu/hr ft F. Find the value of heat transfer coefficient in SI units and cooling time required for this system?
OMG! What a mix of units! Are you studying teat transfer or metrology (joke)?
Please check your "problem statement" because:
7555 pound/cubic foot ~ 121 ton / cubic meter (weird density) ?
Heat capacity in SI unit is J/kg/K so We can not covert BTU/(h.ft.F) to J/(kg.K) ?
Osmium is the densest element, giving 22.6 g/cm3 ~ 1410 lb/ft3. So We have not found any element 7555 lb/ft3 yet.
If BTU/(h.ft.F) is thermal conductivity unit : 269 BTU/(h.ft.F) ~ 465 W/(m.K). Your material may be a silver tube : 655 lb/ft3 =10500 kg/m3
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