Air convection coefficient depends on film temperature, therefore h values can be different at both sides. We must check Biot number for both halves of the flat plate to be able to assume that it's a lumped capacitance.
What if a solid suddenly into contact with another solid in a different temperature and we want to use the lumped capacitance method? How do we write the energy balance?
then it will also depend on x so it will not be valid.... it becomes too complex, and for this, we can use Heisler charts. Reply after 7 months....none of any use 😅😂😂
Air convection coefficient depends on film temperature, therefore h values can be different at both sides. We must check Biot number for both halves of the flat plate to be able to assume that it's a lumped capacitance.
hello, can I get access to the textbook that you are extracting these courses from please?
What if we don't neglect radiation in the first case, meaning convection + radiation? do we still use this method?
What if a solid suddenly into contact with another solid in a different temperature and we want to use the lumped capacitance method? How do we write the energy balance?
is lumped capacitance approximation is valid if we don't ignore the radiation term ?
then it will also depend on x so it will not be valid.... it becomes too complex, and for this, we can use Heisler charts.
Reply after 7 months....none of any use 😅😂😂
we can check validation by using the Biot number which should be < 0.1
@@indianmanhere no worry
@@sainagupta6475 Tomorrow is my midsem exam of this subject 🤕
In radiation it's get too complicated🥲