The Effect of the Important Variables for the Design Novel Milli-Channel Cooling System on the Evaporator Performance by the Taguchi Method

Abstract

Optimizing controllable parameters is crucial to milli-channel cooling system design. This study investigates the heat transfer and hydrodynamic properties of a novel annular flow boiling process of water in milli-channels with better pulsation that passes through a rectangular cross section at a constant temperature. By optimizing system operating parameters and vapor and liquid recirculation, the main novelty in this suggested approach is the achievement of continuous thin-film (micron-sized) annular flow conditions. The 3D simulation model created by a 1D simulation technique has certain boundary restrictions to guarantee the existence of a thin layer of annular flow across the boiler’s whole surface. In Taguchi analysis, the signal-to-noise ratio is determined by using the following input parameters: the Reynolds number, the heated surface temperature, and the pulsatile character of fluid flow. According to the findings, the vapor quality in pulsatile flow is estimated to be 2% to 3% greater than in continuous flow. As thin-film thickness increases, wall temperature declines toward flow. Moreover, there is an approximate 2.5% increase in the mean heat transfer coefficients for pulsatile flow cases compared to continuous flow cases. Furthermore, the average vapor velocity in pulsatile flow is lower than that in continuous flow, according to an analysis of the velocity distributions for each reference zone. The average surface temperature at specified planes in pulsatile flow scenarios is ~ 0.5 K higher than continuous flow situations. © Akadémiai Kiadó Zrt 2025.