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Volume 115
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Studies on desorption features of a shrinking hydrogel particle
Huining Yin, Yimin Xuan *, Jingrui Liu
School of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China
10.1016/j.partic.2026.05.020
Volume 115, August 2026, Pages 267-276
Received 3 March 2026, Revised 5 May 2026, Accepted 28 May 2026, Available online 6 June 2026, Version of Record 11 June 2026.
E-mail: ymxuan@nuaa.edu.cn
Highlights

• A model with shrinkage deformation is developed for desorption prediction.

• The model uniquely couples multiphase flow, heat/mass transfer, and phase change.

• The model accurately predicts hydrogel desorption kinetics and shrinkage.


Abstract

Hydrogel desorption shows promise for thermal management and passive cooling engineering applications, but challenges persist in understanding particle desorption and shrinkage. A Lattice Boltzmann-based phase-field model was developed by combining experiments and mesoscopic simulations to simulate conjugate heat transfer, desorption kinetics, and shrinkage of single hydrogel particles, achieving <5% deviation from experiments. Results show that raising temperature from 343 to 353 K increases 1-h desorption mass by ∼12% of initial mass (vs. 1.3% for 313–323 K), driven by rising saturation vapor pressure and falling evaporation enthalpy. Shrinkage is more sensitive at high temperature and low humidity, with surface area reductions of ∼17% (343–353 K) and ∼13% (20–30% RH), compared to ∼5% under mild conditions. Reducing particle initial mass from 5.75 g to 0.16 g shortens the time to release 50% of the initial water from 516 min to 117 min, indicating greater efficiency for smaller particles. This work bridges the macro-pore scale gap and offers a numerical tool with design insights for passive cooling.

Graphical abstract
Keywords
Desorption; Hydrogel particle; Lattice Boltzmann method; Shrinkage deformation; Heat and mass transfer
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