Modified model of drying process of a polymer liquid film taking effects of latent heat and heat conductivity into account

2003 ◽  
Author(s):  
Hiroyuki Kagami
Keyword(s):  
Liquid Film ◽  
Latent Heat ◽  
Heat Conductivity ◽  
Drying Process ◽  
Modified Model ◽  
Polymer Liquid

Fundamental understanding of removal of liquid thin film trapped between fibers in the paper drying process: A microscopic approach

TAPPI Journal ◽  
2020 ◽  
Vol 19 (5) ◽  
pp. 249-258
Author(s):  
ZAHRA NOORI ◽  
JAMAL S. YAGOOBI ◽  
BURT S. TILLEY
Keyword(s):  
Thin Film ◽  
Liquid Film ◽  
Thin Liquid Film ◽  
Bound Water ◽  
Free Water ◽  
Intermediate Stage ◽  
Convective Drying ◽  
Drying Process ◽  
Paper Drying ◽  
Vof Model

In the fabrication of paper, a slurry with cellulose fibers and other matter is drained, pressed, and dried. The latter step requires considerable energy consumption. In the structure of wet paper, there are two differ-ent types of water: free water and bound water. Free water can be removed most effectively. However, removing bound water consumes a large portion of energy during the process. The focus of this paper is on the intermediate stage of the drying process, from free water toward bound water where the remaining free water is present on the surfaces of the fibers in the form of a liquid film. For simplicity, the drying process considered in this study corresponds to pure convective drying through the paper sheet. The physics of removing a thin liquid film trapped between fibers in the paper drying process is explored. The film is assumed to be incompressible, viscous, and subject to evaporation, thermocapillarity, and surface tension. By using a volume of fluid (VOF) model, the effect of the previously mentioned parameters on drying behavior of the thin film is investigated.

Disjoining pressure measurements using a microfabricated groove for a molecularly thin polymer liquid film on a solid surface

2004 ◽  
Vol 121 (9) ◽  
pp. 4358-4363 ◽  
Author(s):  
Kenji Fukuzawa ◽  
Jun Kawamura ◽  
Takanori Deguchi ◽  
Hedong Zhang ◽  
Yasunaga Mitsuya
Keyword(s):  
Liquid Film ◽  
Solid Surface ◽  
Disjoining Pressure ◽  
Pressure Measurements ◽  
Polymer Liquid ◽  
Thin Polymer

A Thermodynamic Balance Model for Liquid Film Drying Kinetics of a Tablet Film Coating and Drying Process

2019 ◽  
Vol 20 (5) ◽  
Author(s):  
Bumjoon Cha ◽  
Shaun C. Galbraith ◽  
Huolong Liu ◽  
Seo-Young Park ◽  
Zhuangrong Huang ◽  
...  
Keyword(s):  
Liquid Film ◽  
Film Coating ◽  
Drying Kinetics ◽  
Balance Model ◽  
Drying Process ◽  
Kinetics Of

Direct Simulation of Spray Cooling: Effect of Multiple Droplet Impact and Latent Heat of Vaporization of Coolant Liquid on Heat Transfer

2008 ◽  
Author(s):  
Mita Sarkar ◽  
R. Panneer Selvam ◽  
Rengasamy Ponnappan
Keyword(s):  
Heat Transfer ◽  
Liquid Film ◽  
Latent Heat ◽  
Stokes Equations ◽  
Thin Liquid Film ◽  
Spray Cooling ◽  
Droplet Impact ◽  
Vapor Bubbles ◽  
Heat Of Vaporization ◽  
Latent Heat Of Vaporization

Spray cooling is a way of efficiently removing the heat from a hot surface and considered for high power system such as advanced lasers. The heat transfer phenomenon in spray cooling is complex in nature because it occurs due to conduction, convection and phase change. The numerical model of spray cooling is done by solving the set of incompressible Navier-Stokes equations using finite difference method. Level set method is used to capture the liquid vapor interface in our multiphase flow model. Our previous 2D model which included single droplet impact on single growing vapor bubble is modified to introduce multiple droplets impact on thin liquid film with multiple growing vapor bubbles. Though the previous model was effective so far to predict the spray cooling phenomena and also the parameters for high heat removal, but the actual spray cooling phenomena consists of multiple droplets impact on multiple growing vapor bubbles at different time instances. To understand the spray cooling further and to represent it more realistically the inclusion of multiple droplets and multiple vapor bubbles is essential. In the present work, an investigation on the effect of latent heat of vaporization of coolant is conducted for the case of a thin liquid film of 44 μm in removing the heat and bubble growth when a liquid spray droplet is impacting. The flow and heat transfer details are presented for multiple droplet impacts on thin liquid film with multiple growing vapor bubbles.

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