A numerical study is made of the freezing of water-saturated porous media in a rectangular cavity subjected to multiple heat sources with different temperature. Focus is placed on establishing a computationally efficient approach for solving multi-dimensional moving boundary problem in a two-dimensional structured grids. Preliminary grids are first generated by an algebraic method, based on a t...

We extend the previous approach of one of the authors on exact strong-contrast expansions for the effective conductivity se of d-dimensional two-phase composites to case of macroscopically isotropic composites consisting of N phases. The series consists of a principal reference part and a fluctuation part ~a perturbation about a homogeneous reference or comparison material!, which contains mult...

The fascinating ability of algae, insects, and fishes to survive at temperatures below normal freezing is realized by antifreeze proteins (AFPs). These are surface-active molecules and interact with the diffusive water-ice interface thus preventing complete solidification. We propose a dynamical mechanism on how these proteins inhibit the freezing of water. We apply a Ginzburg-Landau-type appro...

The facile nature of mesenchymal stem cell (MSC) acquisition in relatively large numbers has made Wharton's jelly (WJ) tissue an alternative source of MSCs for regenerative medicine. However, freezing of such tissue using dimethyl sulfoxide (DMSO) for future use impedes its clinical utility. In this study, we compared the effect of two different cryoprotectants (DMSO and cocktail solution) on p...

Different kinds of freezing-point regulators were evaluated to expand the freezing point zone of large yellow croaker, and several treatment methods such as ordinary atmospheric pressure, vacuum environment and injection during the process of penetration were compared to reveal the relationship of diffusion velocities, diffusion time and freezing point of the large yellow croaker. Results obtai...

ii Preface This report is written at the Technological University of Denmark. The Department of Micro and Nanotechnology offers the three week course 33443 Microfluidics Theory and Simulation, which sorts under the Microfluidics Theory and Simulation (MIFTS) group [4], headed by Professor Henrik Bruus. The motivation for the present report is built on a contact from the Swedish company HemoCue ...

The phase space slicing method of two cutoffs for next-to-leading-order Monte Carlo style QCD corrections has been applied to many physics processes. The method is intuitive, simple to implement, and relies on a minimum of process dependent information. Although results for specific applications exist in the literature, there is not a full and detailed description of the method. Herein such a d...

We used ultrafast electron diffraction and density-functional theory calculations to gain insight into the charge density wave (CDW) formation on In/Si(111). Weak excitation by a femtosecond-laser pulse results in the melting of the CDW. The immediate freezing is hindered by a barrier for the motion of atoms during the phase transition: The melted CDW constitutes a long-lived, supercooled phase...

Despite extensive progress, current icephobic materials are limited by the breakdown of their icephobicity in the condensation frosting environment. In particular, the frost formation over the entire surface is inevitable as a result of undesired inter-droplet freezing wave propagation initiated by the sample edges. Moreover, the frost formation directly results in an increased frost adhesion, ...