Modelling of Heat Flow When Thermal Conductivity, Specific Heat Capacity and Density All are a Function of Temperature

The ordinary evaporation and explosive vaporization of equilibrium, van der Waals, liquid drops subjected to uniform heating at supercritical temperatures are investigated by means of numerical simulations with the aid of a modified version of the DualSPHysics code. The models include the effects of surface tension, thermocapillary forces, mass transfer across the interface, and liquid–vapor interface dynamics by means of a diffuse-interface description. In contrast to previous simulations in this line, a new non-classical source term has been added to the internal energy equation to deal with the vaporization rate through the diffuse interface. This term is related to the diffusion of the latent heat in the interface zone and is, therefore, necessary for a correct physical description of the liquid–vapor interface structure. As the heating temperature increases the drops undergo surface evaporation, nucleation of an interior vapor bubble, nucleation followed by fragmentation of the liquid, and explosive vaporization. Heating at supercritical temperatures brings the drop out of equilibrium and forces it to rapid quenching into either the miscibility gap, where it undergoes surface evaporation by spinodal decomposition, or the metastable region bounded by the binodal and spinodal curves, where it nucleates a vapor bubble. The results also indicate that at comparable heating, drops of lower density experience faster evaporation rates than drops of higher density.

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Experimental and dynamic thermal numerical investigation of a climate test chamber

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Vatansever

Nurel

2022

Materials Testing

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In order to investigate the effects of environmental conditions on materials, industrial products or to meet long warranty periods of the products, various tests are performed in the climate test chambers. They have a multidisciplinary structure and should be designed according to different operating conditions. So obtaining the mathematical model of them and knowing the performance of dynamic behavior are significant both in the design phase and in the control of the designed system. In this study, a novel model is developed for numerical investigation of heating process of prototype climatic test due to the mentioned needs. A so-called temperature-dependent L-section line approach was developed. The insulation material was divided into seven segments. The thermal conduction coefficients of the insulation material, mass flow rate, and specific heat of the air were modeled as a function of temperature, as distinct from constant-coefficient lumped-parameter approaches. The simulation results were compared with the experimental results for different conditions, it was observed that the presented approach was compatible with the experimental results. This developed model is not only limited to climate test chambers, but can also be applied to different engineering disciplines such as control, energy, heat and mass transfer, building, and construction.

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Modelling of Heat Flow When Thermal Conductivity, Specific Heat Capacity and Density All are a Function of Temperature

Cited by 3 publications

References 28 publications

A review on phenomenological model subtleties for defect assessment in friction stir welding

A review on phenomenological model subtleties for defect assessment in friction stir welding

Smoothed particle hydrodynamics simulations of the evaporation of suspended liquid droplets

Experimental and dynamic thermal numerical investigation of a climate test chamber

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