A review of boiling heat transfer characteristics in binary mixtures

Abstract

This paper reviews the state-of-the-art knowledge of boiling heat transfer in binary mixtures, special emphasis is placed on refrigeration industry. The advantage of using refrigerant mixtures over pure refrigerants include the enhancement of coefficient of performance (COP), better match with the desired thermal load and safer, more environmental-friendly refrigerants. In other words, the concept of using mixtures enables more flexibility for the selection of suitable working fluids in particular applications. The purpose of this review article aims to summarize the important published articles on boiling heat transfer in binary mixtures and innovative technologies, as well as to identify limitations to existing studies and directions for future research of this promising thermal management technique. The present article reviews straightforward on both pool boiling and flow boiling in a systematic and comprehensive way. This article maily focus on the review of the effects of mass diffusion, heating surface characteristics, heats from dilution and dissolution on pool boiling heat transfer of binary mixtures, as well as the effects of flow orientation, flow regime and flow instability on flow boiling heat transfer of binary mixtures. Many papers reviewed herein relate to the heat transfer correlations during boiling of binary mixtures. The review reveals that numerical simulations of boiling in binary mixtures, the benefits of surface modification on boiling of binary mixtures and the flow boiling of highly viscous pseudo-plastic mixtures have been scarcely investigated and require further investigation.

Water and Ethanol as Refrigerant Mixture Enabling Adsorption Cooling below 0 °C

“…This reduction is well known for nucleated pool boiling. [ 59 ] The investigation of the nucleated pool boiling of water–ethanol mixtures shows an apparent reduction of the heat transfer coefficient with increasing ethanol mole fraction. [ 60 ] However, we used finned tubes as a heat exchanger in the evaporator to apply thin‐film evaporation.…”

Experimental Investigation of Two-Phase Flow Boiling Heat Transfer Coefficient and Pressure Drop of R448A inside Multiport Mini-Channel Tube

“…In contrast to pure fluids, zeotropic mixture refrigerants such as R448A are prone to heat transfer degradation in both nucleate boiling and convective boiling (Zhang [20], Xu [21], and Shah [22]). During nucleate boiling, the more volatile components evaporate first, which resulted in vapor bubbles rich in the more volatile components, while the bulk liquid has a higher concentration of the less volatiles components.…”

Speleothem-Inspired Copper/Nickel Interfaces for Enhanced Liquid–Vapor Transport by Marangoni and Soret Effects

“…A number of previous research works have conducted investigations on the nucleate boiling of binary mixtures on surfaces that are either plain or smooth. 35 These studies were conducted under steady-state and atmospheric pressure conditions, covering a broad spectrum of compositions, from pure components to diluted mixtures. The objective of these studies was to formulate empirical models for the heat transfer coefficient (HTC) on untextured surfaces.…”

“…Nucleate boiling encompasses the creation, expansion, and release of vapor bubbles from heated surfaces, and these processes can be tuned by utilizing porous and wicked interfaces that enhance heat transfer characteristics by facilitating capillary wicking and augmenting nucleation sites. While the nucleate boiling mechanisms of pure components and mixtures on plain surfaces ,,, are well-understood, the effects of surface characteristics on binary mixture nucleate boiling heat transfer remain underexplored.…”