6.1 a) Define a wetted perimeter. b) What is the significance of an hydraulic di
ID: 1859931 • Letter: 6
Question
6.1
a) Define a wetted perimeter.
b) What is the significance of an hydraulic diameter in forced convection inside tubes and ducts?
6.1.1 Explain each of the terms in equation 6.5.
6.1.2 How does the nature (laminar or turbulent) of the flow affect heat transfer?
6.1.3 How does the value of the Prandtl number affect the heat transfer in a pipe, and why?
6.1.4 What physical aspect causes entrance effects? (no, you may not use %u2018the entrance%u2019 as your answer %u2013 explain with physics please)
6.2 How does the surface condition (uniform heat flux or uniform surface temperature) alter the heat transfer analysis of laminar forced convection in a long tube?
6.3.1 Why must we use different correlations for laminar forced convection in short circular and rectangular ducts?
6.3.2 What resource would you use to analyze fully developed laminar forced convection in ducts of noncircular cross section?
6.4 What do we need to take into account for turbulent heat transfer in a pipe that we did not in laminar heat transfer?
7.1 Explain the physical genesis of separation, in particular as it relates to the nature of the flow direction and pressure gradient.
7.2
a) How does the cross-flow around a cylinder change with a laminar or turbulent boundary layer?
b) How will the Nusselt number calculation change for the applications discussed in this chapter (hint: length scale)
7.2.1 What is a hot-wire anemometer? On what heat transfer principle is it based?
7.2.2 Provide one application for heat transfer around a sphere.
Explanation / Answer
6.1
a) Wetted permimeter is the permiter of the region through which the heat transfer takes place...or through which the fluid (in your case air, or water) flows.
b) hydraulic diameter helps in finding the reynolds number by representing a non circular duct as a circular pipe....so ut basically helps u in imagining all the ducts as circular..for ease in calculations...
6.1.1)No equation mentioned...
You have asked so many questions...ask one by one...
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