Computational parametric investigation of solar air heater with dimple roughness in S-shaped pattern

A comparison of the efficiency of the open cell foam (OCF) models is carried out. Geometrical models are constructed by the methods of simple cubic, body-centered cubic, and face-centered cubic. The parameter of the material efficiency is defined as the composition of the material surface area and the gas residence time in the porous media. The analytical evaluation shows different values of effective porosity for different construction models of the material. In this case, for all considered models, the effective porosity is in the range of 0.741-0.821.

/pdf/evaluation-of-the-effective-porosity-of-an-open-cell-foam-357kd9zmt7.pdf

Evaluation of the effective porosity of an open cell foam material for using in heat and mass transfer numerical simulations

In the present work, based on numerical simulation, a comparative analysis of the flow of a chemically reacting gas flow through a catalyst is performed using the example of selective hydrogenation of acetylene in a wide range of flow temperatures variation. Catalyst models are based on open-cell foam material. A comparison is also made with calculations and experimental data for a granular catalyst. The porosity and cell diameter were chosen as variable parameters for the porous catalyst. The results of numerical studies were obtained in the form of component concentration fields of the gas mixture, vector fields of gas movement, values of conversion, and selectivity of the reaction under study. The parameters of the porous material of the catalyst are determined for the maximum efficiency of the process under study.

/pdf/numerical-simulation-of-heat-and-mass-transfer-in-an-open-21dgt5oi.pdf

Numerical Simulation of Heat and Mass Transfer in an Open-Cell Foam Catalyst on Example of the Acetylene Hydrogenation Reaction

The problem of drowning is one of the most serious issues in terms of human life and health safety. Drowning victims often fall victim to accidental circumstances or unintentional actions, and the number of such incidents is significant. Thousands of drownings occur worldwide every year, resulting in a significant loss of lives, both among adults and children. This article focuses on exploring the prerequisites and developing a computer vision system for drowning detection. Drowning is a serious problem that poses substantial social, economic, and medical consequences for human life and health. The article discusses key computer vision technologies, image processing algorithms, and object recognition methods.

Prerequisites for developing the computer vision system for drowning detection

Researches of blocks of sprinklers of cooling towers with jetfilm devices are presented. The conducted numerical studies allow us to estimate the influence of the design and operating parameters of the proposed contact device on the efficiency of the process of cooling the recycled water. The increase in the average gas velocity leads to a more intense flow of water drops and more efficient cooling. To achieve high performance, it is necessary to create zones of drip interaction of phases with droplet sizes up to 100 μm at relatively low speeds of two-phase gasliquid flow. Under such conditions, the drop can be cooled by more than 10°C within one contact stage. The proposed sprinkler units with jet-film contact devices will be able to achieve a lower level of cooling water temperatures in the cooling towers of industrial enterprises at relatively low operating costs.

/pdf/efficiency-of-cooling-the-water-droplets-within-jet-film-1u0jskf696.pdf

Efficiency of cooling the water droplets within Jet-Film unit of cooling tower filler

Correction: Assortment of latent heat storage materials using multi criterion decision making techniques in Scheffler solar reflector

This paper presents the results of theoretical and experimental studies to determine the optimal thickness of thermal insulation from basalt fiber and aerogel products for pipelines at temperatures of 300 and 600 °C. We carried out a comparison of the key thermophysical characteristics of the claimed heat-insulating materials. We performed a thermal imaging survey of the furnace chimney, insulated with basalt fiber and aerogel, while controlling the temperature of the flue gases by establishing the required ratio of the flow rate of natural gas and oxidizer. The temperature gradient along the thickness of the thermal insulation was obtained using a numerical tool developed in ANSYS. The results show that aerogel surpasses basalt fiber in all key thermophysical characteristics. At the same time, the only barrier to widespread industrial production and use of aerogel in the high-temperature thermal insulation segment is its market cost, which is still several times higher than that of basalt fiber in terms of an equivalent performance.

/pdf/aerogel-product-applications-for-high-temperature-thermal-1l98872p.pdf

Aerogel Product Applications for High-Temperature Thermal Insulation

The motion of aerosol particles in open cell foam material is studied. The porous medium is investigated for a three-dimensional case with detailed simulation of cellular structures within an ordered geometry. Numerical calculations of the motion of particles and their deposition due to inertial and gravitational mechanisms are performed. Deposition efficiency curves for a broad range of particle sizes are constructed. The effect deposition mechanisms have on the efficiency of the porous material as a filter is analyzed.

Numerical Simulation of the Motion of Aerosol Particles in Open Cell Foam Materials

A geometrical model of the open cell foam was created as an ordered set of intersecting spheres. The proposed model closely describes a real porous cellular structure. The hydrodynamics flow was calculated on the basis of a simple model in the ANSYS Fluent software package. A pressure drop was determined, the value of which was compared with the experimental data of other authors. As a result of the conducted studies, we found that a porous structure with smoothed faces provides the smallest pressure drop with the same porosity of the package. Analysis of the calculated data demonstrated that the approximation of an elementary porous cell substantially distorts the flow field. This is undesirable in detailed modeling of the open cell foam.

Investigation of the influence of the open cell foam models geometry on hydrodynamic calculation

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