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Results tagged with convection
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user 290987
transport mechanism involving bulk motion of a medium
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Does the convective heat transfer coefficient depend on temperature difference?
Forced convection is taking place. I'm convinced that the value of heat transfer coefficient h, depends on fluid properties, fluid flow regime, surface roughness and geometery of surface area. …
- 541
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Is this value of Critical Reynolds Number also valid for non circular ducts?
The flow remains laminar in case of internal flow through pipes up to a Reynolds number of 2300, for most practical cases. Is this value valid only for circular pipes or even for non circular ducts?
- 541
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Arithmetic and Log mean temperature difference of a double pipe parallel flow heat exchanger
Consider a double pipe parallel flow heat exchanger. For such a heat exchanger the LMTD is given as
$$\Delta T _{LM}= \frac{\Delta T_i-\Delta T_e}{ln(\frac{\Delta T_i}{\Delta T_e})} $$
The relation ab …
- 541
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In this scenario, if I continue to increase the length of heat exchanger how will the temper...
Consider a counter flow double pipe heat exchanger inside which the cold fluid enters at 20 degrees Celsius and hot fluid enters at 100 degrees Celsius. Initially the length of the heat exchanger is L …
- 541
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Maximum heat transfer rate in effectiveness NTU method for heat exchangers
The effectiveness NTU method is used for determining the heat transfer rate for a heat exchanger, with known inlet temperatures and surface area.
It makes use of effectiveness which is defined as
$$\e …
- 541
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218
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Average Nusselt number and heat transfer coefficient
For the flow over a flat plate of length L, how the average Nusselt Number over a length L is equal to
$$Nu_{avg} = \frac{h_{avg}L}{k_f}$$
where $h_{avg}$ is the average heat transfer coefficient over …
- 541
3
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729
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What does this assumption mean in heat exchanger analysis?
I'm studying heat transfer at graduate level, and in the process of deriving LMTD of a heat exchanger, the book took the following assumption :
Any axial heat conduction will be neglected.
What that t …
- 541
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What is the temperature profile of hot and cold fluids for a double pipe parallel flow heat ...
In books, they just mention the temperature profile is exponential. Can someone help me come up with the exact temperature profile (the relation) for the hot and cold fluids in a double pipe parallel …
- 541
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While determining LMTD for a heat exchanger do we assume, the tube wall to be at a constant ...
The derivation of Log Mean Temperature Difference (LMTD) for a Heat exchanger at preliminary level makes some assumptions like, constant specific heats, steady state operation, no changes in kinetic a …
- 541