scholarly journals Experimental studies of unsteady processes of cryogenic liquid evaporation in rocket tank model

2021 ◽  
Vol 5 (4) ◽  
pp. 89-98
Author(s):  
V. I. Trushlyakov ◽  
◽  
V. A. Urbansky ◽  
A. N. Pavlenko ◽  
V. E. Zhukov ◽  
...  
Keyword(s):  
Thermal Loading ◽  
Exchange Process ◽  
Experimental Studies ◽  
Cryogenic Liquid ◽  
Mass Exchange Process ◽  
Heat And Mass Exchange ◽  
Tank Model ◽  
Model Liquid ◽  
Helium Gas ◽  
Liquid Evaporation

The program and the methodology of the experiment and the results of the experiment have been developed. The experimental bench and metrological support have been created, liquid nitrogen (LN) has been considered as a model liquid. A database of heat and mass exchange process parameters (pressure, temperature) under the modes of tank inflation with helium gas up to 2 atm., given external thermal loading, pressure relief after reaching 4 atm. up to 1 atm. The technique of processing the results of pressure and temperature measurements with the assumptions and limitations is given.

scholarly journals PARAMETRIZATION OF THE HEAT AND MASS EXCHANGE PROCESS IN THE SURFACE ATMOSPHERIC LAYER

2021 ◽  
Vol 3 (72) ◽  
pp. 21-26
Author(s):  
B. Kantsyrev
Keyword(s):  
Mass Exchange ◽  
Numerical Models ◽  
Exchange Process ◽  
Computational Grid ◽  
Modeling Processes ◽  
Atmospheric Layer ◽  
Surface Atmospheric Layer ◽  
Mass Exchange Process ◽  
Heat And Mass Exchange

When constructing numerical models of the atmosphere and the surface atmospheric layer (PAS) interacting with it, the “parametrization” approach is used, that is, the representation of processes with scales smaller than the scale of the cells of the computational grid intended for modeling processes of larger scales.

scholarly journals MATHEMATICAL MODELS OF THE HEAT AND MASS EXCHANGE PROCESS DURING PNEUMO-TRANSPORTATION OF COTTON-RAW.

2020 ◽  
Vol 91 (11) ◽  
pp. 508-514
Author(s):  
Alisher Mamatov ◽  
◽  
Azimjan Parpiev ◽  
Abdul-malik Kayumov ◽  
◽  
...  
Keyword(s):  
Mathematical Models ◽  
Mass Exchange ◽  
Exchange Process ◽  
Mass Exchange Process ◽  
Heat And Mass Exchange

scholarly journals MATHEMATICAL MODELING OF THERMOGRAVITATIONAL AND THERMOCA-PILLARY CONVECTION IN GAS-LIQUID PROCESSES

2021 ◽  
Vol 2021 (1) ◽  
pp. 58-66
Author(s):  
Evgeniy Podoplelov ◽  
Aleksey Bal'chugov ◽  
Anatoliy Dement'ev ◽  
Anatoliy Glotov
Keyword(s):  
Mathematical Modeling ◽  
Mass Transfer ◽  
Phase Boundary ◽  
Mass Exchange ◽  
Exchange Process ◽  
Transfer Coefficients ◽  
Mass Exchange Process ◽  
Convective Flows ◽  
Liquid Phases ◽  
Turbulent Pulsations

. The interaction of gas and liquid phases in some cases is accompanied by the spontaneous occur-rence of convective flows and turbulent pulsations at the phase boundary and in adjacent areas. Hy-drodynamic instability allows to accelerate the interfacial transfer of matter and leads to an increase in mass transfer coefficients. Research in this field is not only theoretical, but also practical, since sur-face convection can be artificially created in apparatus for intensifying the mass exchange process.

scholarly journals Study of non-isothermal liquid evaporation in synthetic micro-pore structures with hybrid lattice Boltzmann model

2019 ◽  
Vol 866 ◽  
pp. 33-60 ◽  
Author(s):  
Feifei Qin ◽  
Luca Del Carro ◽  
Ali Mazloomi Moqaddam ◽  
Qinjun Kang ◽  
Thomas Brunschwiler ◽  
...  
Keyword(s):  
Lattice Boltzmann ◽  
Evaporation Rate ◽  
Experimental Studies ◽  
Liquid Films ◽  
Lattice Boltzmann Model ◽  
Layer By Layer ◽  
Pore Structures ◽  
Liquid Evaporation ◽  
Cooling Effects ◽  
Boltzmann Model

Non-isothermal liquid evaporation in micro-pore structures is studied experimentally and numerically using the lattice Boltzmann method. A hybrid thermal entropic multiple-relaxation-time multiphase lattice Boltzmann model (T-EMRT-MP LBM) is implemented and validated with experiments of droplet evaporation on a heated hydrophobic substrate. Then liquid evaporation is investigated in two specific pore structures, i.e. spiral-shaped and gradient-shaped micro-pillar cavities, referred to as SMS and GMS, respectively. In SMS, the liquid receding front follows the spiral pattern; while in GMS, the receding front moves layer by layer from the pillar rows with large pitch to the rows with small one. Both simulations agree well with experiments. Moreover, evaporative cooling effects in liquid and vapour are observed and explained with simulation results. Quantitatively, in both SMS and GMS, the change of liquid mass with time coincides with experimental measurements. The evaporation rate generally decreases slightly with time mainly because of the reduction of liquid–vapour interface. Isolated liquid films in SMS increase the evaporation rate temporarily resulting in local peaks in evaporation rate. Reynolds and capillary numbers show that the liquid internal flow is laminar and that the capillary forces are dominant resulting in menisci pinned to the pillars. Similar Péclet number is found in simulations and experiments, indicating a diffusive type of heat, liquid and vapour transport. Our numerical and experimental studies indicate a method for controlling liquid evaporation paths in micro-pore structures and maintaining high evaporation rate by specific geometry designs.

scholarly journals Environmental Management of Production Processes in Heating Systems when Receiving Magnetic Water in Reagent-Free Method with the Aim of Environmentalization

2018 ◽  
Vol 7 (3.2) ◽  
pp. 621 ◽  
Author(s):  
Petro Kulikov ◽  
Olena Bondar ◽  
Nataliia Zhuravska
Keyword(s):  
Environmental Management ◽  
Electromagnetic Interaction ◽  
Exchange Process ◽  
Heating System ◽  
Mass Exchange Process ◽  
Basic Principles ◽  
Industrial Systems ◽  
Heating Systems ◽  
Quantitative Indicators ◽  
Magnetic Water

It has been proved that the environmental management of industrial systems of a heat supply, under the terms of the application of the method of preparation of reagent-free industrial water depends on ensuring the implementation of its basic principles. It is shown that the electromagnetic interaction of multi factorial criterial components of the process of magnetization of water is performed through the mechanism of feedback in the heating system. And the mechanism of feedback in the heating system is characterized by the properties of loop negative feedback and therefore is auto regulation of the process of magnetization of water takes place. Quantitative indicators of integral system of control over the process of magnetization of water in heating systems were defined. Both the graduation orderliness of mass exchange process and its additive function must be within ≤ 1.  

Composite multi-layer coatings for end mills

2021 ◽  
pp. 15-19
Author(s):  
M. Sh. Migranov ◽  
A.M. Migranov
Keyword(s):  
Thermal Loading ◽  
Cutting Tools ◽  
Experimental Studies ◽  
Multilayer Coatings ◽  
Wear Resistant Coatings ◽  
Milling Operations ◽  
The Coefficient Of Friction ◽  
End Mills ◽  
Cutting Zone ◽  
Coatings For Cutting Tools

The results of theoretical and experimental studies of tribological characteristics of composite multilayer coatings for cutting tools for blade processing by milling are presented. Installed reducing the coefficient of friction, longer tool life and reduced thermal loading of the cutting zone in milling operations with the use of wear-resistant coatings.

scholarly journals Theoretical and Experimental Contributions on the Use of Smart Composite Materials in the Construction of Civil Buildings with Low Energy Consumption

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2310 ◽  
Author(s):  
Vasile Bendic ◽  
Dan Dobrotă
Keyword(s):  
Phase Change ◽  
Thermal Energy ◽  
Thermal Loading ◽  
Physical Stability ◽  
Experimental Studies ◽  
Absorption Capacity ◽  
Night Time ◽  
Solidification Temperature ◽  
Efficient System ◽  
Smart Composite Materials

The paper presents the theoretical and experimental studies undertaken for the realization of an intelligent composite material with phase shift that has optimal characteristics in the thermal energy storage process and an experimental method for integrating the material with phase change in a possible efficient system to be used in the construction of a dwelling. It analyzes the main factors in designing such systems (the temperature limits between which the system must operate, the melting/solidification temperature of the Phase Change Material (PCM), the latent heat of the PCM, the degree of thermal loading, the bed configuration of PCM capsules and a PCM-RB01 material is set. A micro-encapsulation method was chosen and a “solar wall” is made where the incident solar radiation is absorbed by the PCM embedded in the wall, so the stored heat is used for heating and ventilation of a home. Experimental research has shown that developed PCM allows a maximum room temperature reduction of about 4 °C during the day and can reduce the night-time heating load. Also, despite the lower thermal energy absorption capacity, the developed PCM-RB01 material provides a superior physical stability compared to the classical types of integration.

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