Convective heat transfer coefficients

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SUMMARY

The discussion centers on calculating convective heat transfer coefficients for a condensation-based countercurrent heat exchanger involving liquid water and steam. The equation presented, Q = (T_steam - T_water) / (1/(A*h_water)*(d/A*k_wall)*(1/h_steam)) = L·ṁ, highlights the relationship between temperature difference, heat transfer coefficients, and latent heat. The primary focus is on determining the heat transfer coefficient for water, particularly in a tube flow scenario, as it is expected to be the dominant resistance in the heat transfer process. Reference to "Transport Phenomena" by Bird, Stewart, and Lightfoot is suggested for further understanding.

PREREQUISITES
  • Understanding of heat exchanger design principles
  • Familiarity with convective heat transfer coefficients
  • Knowledge of fluid dynamics, specifically flow velocity effects
  • Basic thermodynamics, including latent heat concepts
NEXT STEPS
  • Research methods for calculating convective heat transfer coefficients in tube flows
  • Study the principles outlined in "Transport Phenomena" by Bird, Stewart, and Lightfoot
  • Explore the impact of flow velocity on heat transfer coefficients
  • Investigate the design and analysis of condensation-based heat exchangers
USEFUL FOR

Engineers and researchers involved in thermal system design, particularly those working with heat exchangers, fluid dynamics, and thermodynamic analysis of condensation processes.

Kelju Ivan
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Hi. I'm trying to make a simple model of a condensation based countercurrent heat exchanger where liquid water and steam flows are separated by a conducting wall. I formed the equations as

Q = \frac{T_{steam}-T_{water}}{\frac{1}{Ah_{water}}\frac{d}{Ak_{wall}}\frac{1}{Ah_{steam}}} = L\dot{m}<br />

where L is the latent heat released by the condensing steam. The trouble is, I don't know the convective heat transfer coefficients. Is there a way to calculate the h-coefficients based on flow velocity or what's the deal with them?
 
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See Transport Phenomena by Bird, Stewart, and Lightfoot. The dominant heat transfer resistance is probably going to be on the water side, so you should be focusing on the heat transfer coefficient to a fluid flowing through a tube at constant wall temperature.
 

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