Recent content by avinashj

Why do gradient show rate of maximum increase not decrease always?

@sophiecentaur -- The actual question is , What will be the rate of heat transfer from the coil to air ? air being inside a close cylinder of approx 30 cms in height and 15 cm in dia. I am interested in "rate of heat transfer" because I want the temperature of air to reach 600 in 30 secs from...

No i don't have any specific heating element. I want to decide upon it from the mentioned condition(1.2 KJ in 30 sec). My concern being -- "Even if equivalent heat is generated at the heating element, what will be the rate of that heat transfer from heating element to the surrounding air?" ...

thanks russ. Actually i want a heat transfer of 1.2 kJ from the heating element to the surrounding air (which is at rest) in given time of 30 seconds. So, in what direction should i proceed?

I am using an heating element to heat the air in a closed container. Joule heating will give me the "heat generated at heating element." I want to know how much of it will be transferred to the surrounding air. Should I be using heat transfer due to all three modes ?