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Heat transfer coefficient in forced convection and its dependence of temperature

Found the answer. The heat transfer coefficient has a dependence on Reynolds number which also has the kinematic viscosity term, which in turn depends on the gas density. So naturally when the density ...
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Why heat transfer happens only via conduction in this case?

Hot fluid rises. So, if the heating element is at the top of a tank, the hot fluid can't rise more that the top of the tank which means it cannot cause convective flow. This is why a kettle is heated ...
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