Parametric Evaluation of the Flow Boiling Heat Transfer Properties of R22 and R407c inside Horizontal Microfin Tube

Evaluation of Correlations of Flow Boiling Heat Transfer of R22 in Horizontal Channels

The calculation of two-phase flow boiling heat transfer of R22 in channels is required in a variety of applications, such as chemical process cooling systems, refrigeration, and air conditioning. A number of correlations for flow boiling heat transfer in channels have been proposed. This work evaluates the existing correlations for flow boiling heat transfer coefficient with 1669 experimental d...

Saturated Flow Boiling Heat Transfer in Horizontal Square Tube

Numerical Investigation of Flow behavior and Heat Transfer Characteristics inside Herringbone Microfin Tube

A numerical investigation is carried out for single phase flow behavior and heat transfer characteristics inside herringbone microfin tube by using a commercial CFD code FLUENT. It solves the three-dimensional NavierStokes equations in strong conservation form. Turbulence closure is provided by the standard k- turbulent model with enhance wall treatment. Numerical results showed that herringbo...

Enhancement Effect of a Microfin Tube in Condensation of R407C

In the present paper the heat exchange performance of a counter flow double-tube condenser for a ternary refrigerant mixture R407C, composed ofHFC32/HFC125/HFC134a, is calculated using a prediction method developed by the present authors. The axial distributions of vapor and liquid bulk mass fraction, temperature, heat flux, mass flux, etc., are obtained for both a smooth tube and a microfin tu...

A General Correlation for Saturated Two-Phase Flow Boiling Heat Transfer Inside Horizontal and Vertical Tubes

A simple correlation was developed earlier by Kandlikar (1983) for predicting saturated flow boiling heat transfer coefficients inside horizontal and vertical tubes. It was based on a model utilizing the contributions due to nucleate boiling and convective mechanisms. It incorporated a fluid-dependent parameter Ffl in the nucleate boiling term. The predictive ability of the correlation for diff...