Answer:
, ,
Explanation:
Let assume that steam has a fully developed and turbulent flow and that tube is smooth and thin-walled. The steam is heated while flowing through the tube. The Nusselt number is given by the Dittus-Boelter equation:
Properties of steam at given pressure and temperature are:
The Reynolds and Prandtl numbers are, respectively:
(which demonstrates the reasonability of the supposition of turbulent flow)
The Nusselt number is:
The Nusselt number has the following definition:
The heat transfer coefficient is:
The convection is the dominant heat transfer mechanism, then:
Answer:
Explanation:
Evaporation results in cooling because water absorbs heat equal to mass times latent heat of evaporation to get converted into vapor .
latent heat of evaporation of water = 2260 x 10³ J / kg or 2260 J / g
in the evaporation of 1 g of water , heat lost = 2260 J
heat lost per minute = 2260 J
heat lost per second = 2260 / 60
= 37.66 J /s
= 37.66 W
So heat lost by dog in watt = 37.66 W.
Something that is really hot and it steams