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Comprehensive Prediction Models for Pressure Drop and Heat Transfer in Fluid Systems

Explore detailed pressure drop and heat transfer prediction models presented by Garimella et al. and Bandhauer et al. Considered parameters include Martinelli parameter, surface tension parameter, void fraction, and more. Obtain insights into single-phase pressure gradients, interfacial shear stress, and film thickness calculations for improved system design.

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Comprehensive Prediction Models for Pressure Drop and Heat Transfer in Fluid Systems

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  1. Pressure drop prediction models • Garimella et al. (2005) • Considered parameters • Single-phase pressure gradients • Martinelli parameter • Surface tension parameter • Fluid and geometric properties Heat and Mass Transfer Laboratory

  2. Pressure drop prediction models • Garimella et al. (2005) Void fraction is calculated using the Baroczy (1965) correlation: Liquid and vapor Re values are given by: Heat and Mass Transfer Laboratory

  3. Pressure drop prediction models Liquid and vapor friction factors: Therefore, the single-phase pressure gradients are given and the Martinelli parameter is calculated: • Garimella et al. (2005) Heat and Mass Transfer Laboratory 3

  4. Pressure drop prediction models Liquid superficial velocity is given by: This velocity is used to evaluate the surface tension parameter: • Garimella et al. (2005) Heat and Mass Transfer Laboratory 4

  5. Pressure drop prediction models Interfacial friction factor: Laminar region: Turbulent region (Blasius): • Garimella et al. (2005) Heat and Mass Transfer Laboratory 5

  6. Pressure drop prediction models The pressure gradient is determined as follows: • Garimella et al. (2005) Heat and Mass Transfer Laboratory 6

  7. Heat transfer prediction models • Bandhauer et al. (2005) • Considered parameters • Pressure drop • Dimensionless film thickness • Turbulent dimensionless temperature • Pr • Fluid and geometric properties • Range / applicability • 0.4 < D < 4.9 mm • R134a • 150 < G < 750 kg/m2s Heat and Mass Transfer Laboratory

  8. Heat transfer prediction models Interfacial shear stress: Friction velocity is now calculated: • Bandhauer et al. (2005) Heat and Mass Transfer Laboratory 8

  9. Heat transfer prediction models Film thickness is directly calculated from void fraction: This thickness is used to obtain the dimensionless film thickness: • Bandhauer et al. (2005) Heat and Mass Transfer Laboratory 9

  10. Heat transfer prediction models Turbulent dimensionless temperature is given by: Therefore, the heat transfer coefficient is: • Bandhauer et al. (2005) Heat and Mass Transfer Laboratory 10

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