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Hi You can find your answer in this book http://web.mit.edu/lienhard/www/ page 416 Good luck

Hello How can i calculate the average Nusslet number for free convection over rectangular duct thx

Hello How can i calculate the Convection Coefficients in a gas mixture for example if i want to use flue gas for heating another process (cogeneration) thx

Thanks for your comments is this true that if i apply 2 thermocouple one with shield and the other without shield (with same characteristic )the difference between result is corresponding of radiation on furnace environment thx

It is 1100°c

you can use this function to change axes back ground 'whitebg' for example whitebg([0 .5 .6]) and if you want to change the figure color back ground the use this function set(gcf,'Color',[1,0.4,0.6]) the umbers are RGB value and you can change it to any color that you want >>

Hello How can i find the effect of radiation on temperature measurement in high temperature stream with thrmocouple for example if i want to measure the high temperature of gas stream in a furnace with thermocouple without shield how much error arise due to the radiation thx

Thank you for your comments the duct is horizental and i want to know for 2 ducts with same cross section area but with diffrent cross section shape what is the heat transfer behavior in this case ? thx

Hello what is the difference in free convection in a duct with circular cross section and rectangular cross section. is this correct that temperature difference decreases exponentially with distance along the duct (circular cross section )but linearly in ractangular duct? thx