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* Effect of radiation on temperature measurement * self-learn Radiation net work Radiation heat exchange with specular surface Radiation with transmitting reflecting and absorbing media Numerical solution Temperature measurement Heat transfer coefficient * summary * review questions * * * * * * * * As the following figures are shown ,you may find the conductors and nonconductors have great difference conductors * Nonconductors the three figures shown is at some Certain Temperature !! * * * 8-5 relation between shape factors * * These are the properties of shape factors. The reciprocal property The enclosure property Decomposability Calculation of the shape factors Based on the properties of shape factors , we can use algebra method and cross-string method ; or we simply use definition equation to integrate its value; we also can look up in handbook of radiation shape factors. In the following slides you will be shown examples of the first two methods mentioned above. Calculation of the shape factors Based on the properties of shape factors , we can use algebra method and cross-string method ; or we simply use definition equation to integrate its value; we also can look up in handbook of radiation shape factors. In the following slides you will be shown examples of the first two methods mentioned above. * Algebra * Solution * * * Cross-string Two surfaces are 2-D, infinite in extend in one direction and characterized by all cross sections normal to the infinite direction being identical. Calculate the shape factor F1-2 . 8-6 . Heat exchange between nonblackbodies There we define two new terms * then * The radiosity The net energy flow leaving the surface * Now take the shape factors into c
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