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Review
. 2019 Dec:91:3-17.
doi: 10.1016/j.cryobiol.2019.09.014. Epub 2019 Oct 4.

Foundations of modeling in cryobiology-II: Heat and mass transport in bulk and at cell membrane and ice-liquid interfaces

Affiliations
Review

Foundations of modeling in cryobiology-II: Heat and mass transport in bulk and at cell membrane and ice-liquid interfaces

Daniel M Anderson et al. Cryobiology. 2019 Dec.

Abstract

Modeling coupled heat and mass transport in biological systems is critical to the understanding of cryobiology. In Part I of this series we derived the transport equation and presented a general thermodynamic derivation of the critical components needed to use the transport equation in cryobiology. Here we refine to more cryobiologically relevant instances of a double free-boundary problem with multiple species. In particular, we present the derivation of appropriate mass and heat transport constitutive equations for a system consisting of a cell or tissue with a free external boundary, surrounded by liquid media with an encroaching free solidification front. This model consists of two parts-namely, transport in the "bulk phases" away from boundaries, and interfacial transport. Here we derive the bulk and interfacial mass, energy, and momentum balance equations and present a simplification of transport within membranes to jump conditions across them. We establish the governing equations for this cell/liquid/solid system whose solution in the case of a ternary mixture is explored in Part III of this series.

Keywords: Cryobiology; Interfacial conditions; Membrane boundary conditions; Transport processes.

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Figures

Figure 1:
Figure 1:
Regions under consideration. Solid lines indicate interfaces. Bulk transport occurs away from solid lines. Here we make no assumptions about region geometry.
Figure 2:
Figure 2:
Schematic of a typical pillbox balance equation. We assume the total width dx+ + dx and cross sectional area A are constant from time t to t + dt. We have that dx=dxo+Vn and dx+=dxo+Vndt. The volume in the left region at time t, for example, is given by Adxo, and if, for example, [ρ] =mass/volume, then the mass at time t is ρAdxo+ρ+Adxo+=(ρdxo+ρ+dxo+)A and the mass at time t + dt is (ρdx+ρ+dx+)A=ρ(dxo+Vndt)A+ρ+(dxo+Vndt)A. The change of mass from t to t + dt is then (ρρ+)VnAdt. On the other hand, note that if the velocity into the left region is v and the velocity out of the right region is v+, then the normal velocity is vn^ and the mass flux over time dt is (ρvρ+v+)n^Adt.
Figure 3:
Figure 3:
Schematic of cell membrane. The interior radius is a and the exterior is b and we assume aba.

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