Single and aqueous-organic two-phase frictional pressure drop and local entropy generation in rectangular millichannel: Experiment and its analysis

摘要

The present research work represents the single and aqueous-organic two-phase frictional pressure drop through the rectangular millichannel of 2 mm width, 10 mm height and 240 mm in length. The channel of the same dimensions is used to explore the pressure drop characteristics for the single and aqueous-organic two-phase flows in packed condition using medium sand as the packing material. The experimental data are interpreted for both packed and unpacked channels comparing with literature. New correlations are proposed to estimate the pressure drop and friction factor data based on the operating variables for the single and aqueous-organic two-phase (water-toluene) flow through the straight channel depending on a wide range of operating variables. The Reynolds number range for the two-phase flow through the unpacked channel was 3010-6124 whereas the particle Reynolds number was 152-467 in case of the packed channel. The variation of local entropy generation rate at a particular temperature gradient in the two-phase flows through the channel is enunciated. The present work may motivate the researchers for the design and development of milli- and micro-channel mass or heat transfer devices.