Unveiling hysteresis of transient boiling: A multimodal perspective

Boiling is widely used in thermal management systems of electronic and energy devices due to its exceptional mass efficiency. However, hysteresis present during boiling makes the boiling curve unable to return along the same path as the rising curve, hindering a thermal management system from achieving precise temperature control. Such thermal crises increase both system instability and the likelihood of system failure. Some studies have explored hysteresis based on steady-state boiling, identifying several types of hysteresis during nucleate boiling. However, the impact of critical heat flux (CHF) on a boiling cycle has not been considered. Therefore, this paper explores hysteresis in transient boiling from a multimodal perspective, offering insights into possible indicators for active and passive thermal control. Multimodal sensing, which integrates thermal, optical, and acoustic measurements, is employed to collect data during transient pool boiling on a copper foam surface. Then, ti..., , # Data from: Unveiling hysteresis of transient boiling: A multimodal perspective

Dataset DOI: [10.5061/dryad.ksn02v7h2](10.5061/dryad.ksn02v7h2)

## Description of the data and file structure

The experimental data were collected from a pool boiling facility, which has three major parts: (a) a heating element that consists of a copper block and cartridge heaters; (b) a closed chamber with flow loops for a chiller (Thermo Scientific Polar ACCEL 500 Low/EA) connecting graham condenser (Ace glass 5953-106) and an in-house built coiled copper condenser; and (c) a synchronized multimodal sensing system. The copper block, electrodeposited with the copper foams, is submerged in deionized water and heated by nine cartridge heaters (Omega Engineering HDC19102), each with a power rating of 50 W, inserted from the bottom. Four T-type thermocouples (Omega Engineering Tj36-CPSS-032U-6) are inserted near the boiling surface of the copper block to measure the temperature gradient, and approximate the...,