Answer:
,
,

Step-by-step 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:
![\dot Q = (24.621\,(W)/(m^(2)\cdot ^(\textdegree)C) )\cdot [\pi\cdot (0.05\,m)\cdot (1\,m) ]\cdot (200^(\textdegree)C-100^(\textdegree)C)](https://img.qammunity.org/2021/formulas/physics/college/hcnehlt22kslt5792y4fk5i1qn4rwulgmy.png)
