Effects of asymmetric cooling and surface wettability on the orientation of the freezing tip

Author:

Starostin Anton1ORCID,Strelnikov Vladimir1ORCID,Dombrovsky Leonid A2ORCID,Shoval Shraga3ORCID,Gendelman Oleg4ORCID,Bormashenko Edward5ORCID

Affiliation:

1. Institute of Technical Chemistry, Perm, Russia

2. Chemical Engineering Department, Faculty of Engineering, Ariel University, Ariel, Israel; X-BIO Institute, University of Tyumen, Tyumen, Russia; Heat Transfer Department, Joint Institute for High Temperatures, Moscow, Russia

3. Department of Industrial Engineering and Management, Faculty of Engineering, Ariel University, Ariel, Israel

4. Faculty of Mechanical Engineering, Technion–Israel Institute of Technology, Haifa, Israel

5. Chemical Engineering Department, Faculty of Engineering, Ariel University, Ariel, Israel

Abstract

Freezing of water droplets placed on the bare and superhydrophobic surfaces of polymer wedges is studied both experimentally and computationally. Two-dimensional numerical calculations of the transient temperature field in a chilled polymer wedge show that the direction of heat flux from the droplet through the thermal contact region with the wedge differs significantly from that from the normal to the wedge surface. A novel approximate computational model is proposed that takes into account the variable area of the water freezing front in the droplet. This model gives a quantitative estimate of the faster freezing of the droplet on the bare surface. The obtained numerical results agree with the laboratory measurements. The velocity of the crystallization front and the droplet deformation including the so-called freezing tip formation are monitored in the experiment. The direction of the freezing cone axis appears to be noticeably different for the cases of bare and superhydrophobic wedge surfaces. This is explained by the fact that the direction of the freezing cone axis is controlled by the local direction of the heat flux. For a hydrophobic wedge surface, the deviation of the freezing tip from the vertical is smaller, because the reduced thermal contact area reduces the influence of the heat flux direction at the wedge surface.

Publisher

Emerald

Subject

Materials Chemistry,Surfaces, Coatings and Films,Process Chemistry and Technology

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