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HEAT TRANSFER PROBLEMS*
General Flow Analysis
8–1C Why are liquids usually transported in circular pipes? 8–2C Show that the Reynolds number for flow in a circular
·
tube of diameter D can be expressed as Re 4m /( D ).
8–3C Which fluid at room temperature requires a larger
pump to move at a specified velocity in a given tube: water or
engine oil? Why?
8–4C What is the generally accepted value of the Reynolds
number above which the flow in smooth pipes is turbulent?
8–5C What is hydraulic diameter? How is it defined? What
is it equal to for a circular tube of diameter?
8–6C How is the hydrodynamic entry length defined for flow
in a tube? Is the entry length longer in laminar or turbulent
flow?
8–7C Consider laminar flow in a circular tube. Will the
friction factor be higher near the inlet of the tube or near the
exit? Why? What would your response be if the flow were
turbulent?
8–8C How does surface roughness affect the pressure drop in
a tube if the flow is turbulent? What would your response be if
the flow were laminar?
8–9C How does the friction factor f vary along the flow direction in the fully developed region in (a) laminar flow and
(b) turbulent flow?
8–10C What fluid property is responsible for the development of the velocity boundary layer? For what kinds of fluids
will there be no velocity boundary layer in a pipe?
8–11C What is the physical significance of the number of
·
transfer units NTU hA/m Cp? What do small and large NTU
values tell about a heat transfer system?
8–12C What does the logarithmic mean temperature difference represent for flow in a tube whose surface temperature is
constant? Why do we use the logarithmic mean temperature
instead of the arithmetic mean temperature?
8–13C How is the thermal entry length defined for flow in a
tube? In what region is the...
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This note was uploaded on 01/28/2010 for the course HEAT ENG taught by Professor Ghaz during the Spring '10 term at University of Guelph.
 Spring '10
 Ghaz

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