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arpatil_31
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What is the difference between constant wall heat flux and constant wall temperature for convective heat transfer correlations?
Convective heat transfer correlations
- Thread starter arpatil_31
- Start date
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- Tags
- Heat Heat transfer
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Discussion Overview
The discussion focuses on the differences between constant wall heat flux and constant wall temperature in the context of convective heat transfer correlations. Participants explore the implications of these boundary conditions on temperature profiles and heat transfer rates in fluid flow scenarios, particularly in pipes.
Discussion Character
- Technical explanation
- Conceptual clarification
- Debate/contested
Main Points Raised
- Some participants explain that in the case of constant wall heat flux, the wall temperature increases with distance, while in constant wall temperature, the wall temperature remains unchanged.
- It is noted that for constant wall heat flux, the temperature gradient normal to the wall is held constant, which affects the heat transfer characteristics.
- One participant expresses confusion regarding the behavior of heat transfer coefficients and temperature differences in pipe flow under constant wall heat flux conditions, suggesting that as the heat transfer coefficient decreases, the wall temperature must increase to maintain constant heat flux.
- A later reply confirms that the temperature difference between the wall and the average fluid temperature becomes constant, while the temperature profile remains consistent radially, with a linear increase along the length of the tube.
Areas of Agreement / Disagreement
Participants generally agree on the definitions of constant wall heat flux and constant wall temperature, but there is some uncertainty regarding the implications of these conditions on temperature profiles and heat transfer coefficients in specific scenarios.
Contextual Notes
The discussion includes assumptions about the behavior of heat transfer coefficients and temperature profiles that may depend on specific conditions not fully explored in the conversation.
Who May Find This Useful
This discussion may be useful for students and professionals interested in thermal engineering, fluid dynamics, and heat transfer analysis, particularly in applications involving convective heat transfer in pipes.