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Condensation, frosting and icing are natural phenomena, and have beenenduring challenges for human society and modern engineering. These phenomenapose a range of issues, from hazardous icy road surfaces, damage to electronicdevices due to condensation, to frost accumulation on power lines and aircraft.Dipropylene glycol (DG) is a non-toxic, non-corrosive, and biologically safesubstance with excellent hygroscopicity, capable of inhibiting condensation andice formation through the vapor sink strategy. However, there has been limitedresearch on DG. Herein, we provides a detailed study of the performance of DGdroplets in suppressing condensation with experiments and theoretical analysis.Results found that a dry zone ring would form around the DG droplet on acooling solid surface. The ratio of the dry-zone radius to the DG dropletradius increases with the solid surface temperature and scales as 1/(Tdew-Tc).Results indicated that the cooling time of substrate surface does not affectthe ratio in a short period. When the temperature is higher, the ratiodecreases slightly with DG droplet volume; while it keeps almost still, whenthe temperature is lower. A theoretical model is also proposed to reveal therelationship between the ratio and the substrate surface temperature. Thesefindings hold the promise of not only enhancing our understanding ofcondensation suppression but also advancing the development of innovativesolutions for various industries, including transportation, electronics,aviation, and power distribution.

Inhibition of water vapor condensation by dipropylene glycol droplets on hydrophobic surfaces via vapor sink strategy