A REVIEW OF STUDYING EFFECT OF RIBS HEIGHT IN TWO –PHASE FLOW ON HEAT TRANSFER COEFFICIENT IN VERTICAL RIBBED DUCT

Abstract

The effect of rib height on the heat transfer coefficient in two-phase flow in vertical ribbed ducts is reviewed.  It consolidates and examines the experimental and numerical studies carried out on rib geometry, flow regimes, and fluid properties. The results indicate that increasing the rib height significantly enhances heat transfer coefficient with increased turbulence and fluid-surface interaction, but not at the expense of significant pressure drop. Optimizing rib height can enhance heat transfer efficiency and lessen energy losses. The role of rib attack angle and flow disturbance as well as the pressure losses associated with each in two-phase heat transfer enhancement are discussed. The energy efficiency and cooling performance can be further improved in the future by integrating ribs geometry variation with Nano fluid in multiphase conditions.