Work

Boiling heat transfer via micro-nano composite gradient and grooved porous structures: Liquid film and vapor dynamics insights

Year: 2025

Type: article

Abstract: The distribution and dynamics of vapor-liquid phases within porous structures critically influence pool boiling heat transfer. Through experimental visualization and quantitative analysis, we identify liquid film area and vapor motion frequency as key parameters directly affecting heat transfer efficiency. From this perspective, we examine the effects of micro-nano composite gradient porous structures and grooved porous structures on pool boiling heat transfer. Results show that gradient microporous structures enhance heat transfer primarily through accelerated vapor expulsion, while exhibit minimal impact on micro-nano composite porous structures. Grooved porous structures promote heat transfer by facilitating "short-cycle" vapor motion within the grooves. We further develop an optimized porous structure integrating grooves with variable pore sizes, which demonstrates superior heat transfer performance compared to all tested samples. This study advances the fundamental understanding of heat transfer mechanisms in micro-nano composite porous structures and expands the theoretical framework for designing multi-scale heat transfer structures.

Source: International Journal of Heat and Mass Transfer

DOI: 10.1016/j.ijheatmasstransfer.2025.127655

Authors: S.Y. Guan, Z.H. Zhang, R. Wu, C.Y. Zhao

Institution: Shanghai Jiao Tong University

Language: English

Topic: Heat Transfer and Boiling Studies

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $4,220

Funder: National Key Research and Development Program of China