What is the meaning of sensible heat?
Sensible heat is heat exchanged by a body or thermodynamic system in which the exchange of heat changes the temperature of the body or system, and some macroscopic variables of the body or system, but leaves unchanged certain other macroscopic variables of the body or system, such as volume or pressure.
Why thin fins are preferred over thick fins?
if the fin has the thickest point forward it improves its ability to handle higher angles of attack, at the cost of some drag, but it can be made thinner because of this angle of attack capability.
What is the formula for calculating heat transfer?
Q= c\times m\times \Delta T In this case, as we know the mass of the water and its specific heat capacity at the given conditions, we can use the above mentioned formula to calculate the amount of heat to be supplied.
Is heat loss positive or negative?
Changes in Internal Energy
| Reduces E | Increases E |
|---|---|
| q < 0 (q negative), heat lost | q > 0 (q positive), heat gained |
| w < 0 (w negative), work done by system | w > 0 (w positive), work done on system |
Can you have a negative heat transfer coefficient?
In addition, with traditional definition of convective heat transfer coefficient, which is based on the temperature difference of an interior surface and room air, the coefficient value can be negative.
What does negative heat flux mean?
Negative heat flux typically means the heat flux is in the direction opposite of the direction assumed to be positive when the equations were derived. Thread Tools. Posting Rules.
What does heat transfer coefficient depend on?
Heat transfer coefficient depends on both the thermal properties of a medium, the hydrodynamic characteristics of its flow, and the hydrodynamic and thermal boundary conditions. The dependence of the Nu and St numbers on the Re and Pr numbers plays an essential role in heat transfer by forced convection.
What does a negative Nusselt number mean?
dimensionless temperature gradient