Abstract:Heat transfer and pressure drop characteristics of mini smooth and microfin tubes were studied numerically using water as working fluid at Reynolds number ranging from 7500 to 17500. Seven microfin tubes were used with the same inner diameters of 4.6 mm and 18° helix angle and with number of fins ranging from 30 to 50, fin apex angle ranging from 10° to 40°, and fin height ranging from 0.1 to 0.15 mm. The numerical results fit well with the empirical correlations for heat transfer coefficients and pressure dro… Show more
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