Question

you are using a silver spon to stir water that judtstarted boiling so that you can achive a more even heat distribution inyour water. the spon is partially immeeesed in boiling water and thermometer in your kithen reads 27degc. the hanle of the spon hascross section of 2mmx 1 cmextends 15 cm in te air fromthe free surface of the water . the heat transfer codfficient at the exposedsirface of the spon handle is 3 /m2.k.

A. determine the temperature difference across the exposed surface of the spoon handle

follow the problem solving guide on the front page . at the minimum your analysis should answer the following question providing detailes justificationS:

A. What are the modes of heat transfer that the spoon is exposed to?

B. I s this a time depnding or steady state problem? why or why ont?

C. Is this a 1-D, 2-D or 3-D problems? why or why not?

D. What is the thermal conductivity of the material ? can you assume it constant and if so , for what ranges?

E. The heat transfer coefficient is a function of many variables. Discuss the varibles and whether the heat transfer coefficient can be assumed to be constant.

F. What boundary condition are you applying and why?

Part B. Can the lumped sum analysis be applyed to the water as it cools? provide justicficationto support your answer?

Answer 1