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I need to know typical emissivity values of quartz porcelain (C110). However, I am not an specialist in ceramics and I have found only very general information. Are these values available in bibliography or should they be estimated by tests? Thanks in advance

Which is the most precise correlation for natural convection around horizontal cylinders? Heat transfer books gives different expresions but they do not say anything about precission or preferred range of application Could somebody recommend me any reference about it?

Is there any correlation for natural convection from finite circular cylinder? Typical correlations (Churchill, etc.) refer to long cylinders Regards

I have no clear the definition of virtual time for current limiting fuses. Is it the time provided by the I-t characteristic of the fuse? Is it the prearcing time or the total operation time? Thanks in advance

Dear all, Does anyone know the thermal emittance value of the brown glazed ceramic used in electric power appliances? Does this value change with temperature? Thanks in advance

Hi all, I want to evaluate convection heat loss for a short cylinder but all correlations are said to be valid for long cylinder (Churchill and Chu, etc). Does anybody know to what extent a cylinder can be considered short or long and so typical correlations can provide a goog estimation for it...

Hi all, I want to evaluate convection heat loss for a short cylinder but all correlations are said to be valid for long cylinder (Churchill and Chu, etc). Does anybody know to what extent a cylinder can be considered short or long and so typical correlations can provide a goog estimation for it...