Forced convection over a cylinder

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SUMMARY

The discussion focuses on the application of heat transfer correlations for a cylinder in forced convection scenarios. The user seeks confirmation on using the Nusselt number (Nu) correlation for both laminar and turbulent boundary layers, specifically Nu=C/m * Re˘m * Pr˘n, with constants C, m, and n provided for each flow regime. The user questions the validity of applying flat plate calculations to a cylindrical surface, emphasizing the need for accurate temperature profile predictions in their experimental setup. The consensus indicates that while some correlations may be applicable, adjustments for geometry and flow characteristics are essential for accurate results.

PREREQUISITES
  • Understanding of Nusselt number (Nu) and its significance in heat transfer.
  • Familiarity with Reynolds number (Re) and its role in fluid dynamics.
  • Knowledge of Prandtl number (Pr) and its impact on heat transfer efficiency.
  • Basic principles of forced convection and boundary layer theory.
NEXT STEPS
  • Research the differences in heat transfer characteristics between flat plates and cylindrical surfaces.
  • Investigate the application of the Dittus-Boelter equation for turbulent flow over cylinders.
  • Learn about computational fluid dynamics (CFD) simulations for modeling heat transfer in cylindrical geometries.
  • Explore experimental methods for measuring heat transfer coefficients in forced convection scenarios.
USEFUL FOR

Engineers, researchers, and students involved in thermal management, fluid dynamics, and heat transfer analysis, particularly those working with cylindrical geometries in forced convection applications.

gasperz
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I am building an apparatus to measure how does fluid speed effect heat transfer from solid on fluid. fluid runs over a cylinder which inner side is kept at a constant temperature. A calculation for surface temperature profile was made for a similar eaxperiment were a flat plate was used instead of a cylinder. I would like to ask weather it is safe to use the same correlation between the nuslet number and reynolds number:
Nu=C/m * Re˘m * Pr˘n
where C = 0.332, m = 1/2 and n = 1/3 for a laminar boundary layer
and C = 0.0287, m = 4/5, n = 3/5 for a turbulent boundary layer
and therefore if calculations for surface temperature profile calculations made for flat plate alo apply for cylinder.
Thank you for your answers
 

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