Articles Posted in the " Convection " Category

  • HEAT TRANSFER MCQ-RADIATION, CONVECTION, BOILING—

    HEAT TRANSFER MCQ-RADIATION, CONVECTION, BOILING—

    HEAT TRANSFER MCQ-RADIATION, CONVECTION, BOILING— Law for the monochromatic radiation emissive power is (a) Stephen’s Boltzmann Law (b) Planck’s Law (c) Wien’s displacement Law (d)None ANS: (b) Radiosity is defined as (a) Total reflected radiations (b) Total emitted radiations (c) Difference of emitted and reflected radiations (d) None ANS: (b) Absorbtivity is zero for an opaque […]


  • HEAT TRANSFER—M C Q on Radiation, Convection and Boiling

    HEAT TRANSFER—M C Q on Radiation, Convection and Boiling

    HEAT TRANSFER—M C Q on Radiation, Convection and Boiling Which Law gives the monochromatic emissive power? (a) Stefan’s Boltzmann Law (b) Kirchoff’s Law (c) Wien’s Displacement Law (d) None ANS: (d) All types of radiations are emitted from a body at (a) Room temperature (b) Boiling temperature of water (c) Melting temperature of steel (d) None ANS: (d) Radiations are more harmful with […]





  • **HEAT TRANSFER MECHANICAL ENGINEERING Heat Exchangers–2—U—Overall heat transfer Coefficient

    **HEAT TRANSFER MECHANICAL ENGINEERING Heat Exchangers–2—U—Overall heat transfer Coefficient

    *HEAT TRANSFER MECHANICAL ENGINEERING Heat Exchangers–2—U—Overall heat transfer Coefficient DEFINITION OF OVERALL HEAT TRANSFER COEFFICIENT ‘U’ Overall heat transfer coefficient for conduction and convection taking place simultaneously.Its units are W/m2 K. 1/UA =1/hiAi+fi + ln (r2/r1)/2πkL +1/hoAo + fo Where fi  and  fo are fouling resistances on the inner and outer surfaces. CALCULATION OF U (i) On the basis […]




  • Empirical Corelations for Free and Forced Convection

    Empirical Corelations for Free and Forced Convection

    Empirical Correlations for Free and Forced Convection Free Convection  TABLE: (i) CRITERIA FOR LAMINAR FLOW & TURBULENT FLOW IN FREE CONVECTION                     (ii) THE IMPERRICAL CORRELATION  in Free Convection Free Convection Laminar condition Turbulent condition Over a horizontal flat plate with hot surface upwards Gr Pr […]