Increased pressure of nitrogen-oxygen mixture and the temperature in animals

2015 ◽  
Vol 9 (4) ◽  
pp. 0-0 ◽  
Author(s):  
Вётош ◽  
A. Vetosh ◽  
Лучаков ◽  
Yu. Luchakov ◽  
Несмеянов ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Mathematical Model ◽  
High Pressure ◽  
Oxygen Consumption ◽  
Mathematical Models ◽  
Oxygen Mixture ◽  
Neutral Zone ◽  
Hyperbaric Chamber ◽  
Gas Medium ◽  
Increased Pressure

The work is devoted to the study of thermoregulation of rats under high pressure in the respiratory- gas medium, both experimentally and in mathematical models. Experiments conducted on rats in a hyperbaric chamber, where the pressure of the gas medium was raised to 4,1 MPa. The pressure increase in the hyperbaric chamber up to 2,1 MPa leds to augmentation of oxygen consumption by 1.7 times and at a pressure of 4.1 MPa – to oxygen consumption by 2,3 times. Thermo-neutral zone in animals, on the contrary, is progressively decreased with increasing pressure in the hyperbaric chamber. Using a mathematical model, it has been shown that the augmentation of pressure in the hyperbaric chamber to 2,1 MPa leads to increase the heat transfer in 1,9 times. The augmentation of pressure in the hyperbaric chamber to 4,1 MPa increases the heat transfer from the organism body in the medium in 2,6 times.

Temperature of animals and enhanced pressure of nitrogen-oxygen mixture

2016 ◽  
Vol 14 (4) ◽  
pp. 67-70
Author(s):  
Yury I Luchakov ◽  
Alexandr N Vyotosh ◽  
Petr D Shabanov
Keyword(s):  
Mathematical Model ◽  
Oxygen Consumption ◽  
Oxygen Mixture ◽  
Thermoneutral Zone ◽  
Gas Environment

The rat thermoregulation in conditions of enhanced pressure in inhalation gas environment was assessed both experimentally and using mathematical model. All experiments were carried out on rats in barocamera, where the pressure of gas environment was increased gradually up to 4.1 МPа. The pressure enhancement of gas environment up to 2.1 MPa stimulated oxygen consumption in 1.7-fold, when pressure enhancement up to 4.1 MPa did it up to 2.3-fold. The thermoneutral zone of rats was gradually reduced in these conditions, e.g. with enhancement of preasure. Using mathematical model we have shown that pressure enhancement up to 2.1 MPa in barocamera increased thermodelivery in 1.9-fold whereas pressure enhancement up to 4.1 MPa did it in 2.6-fold.

Study of Convective Heat Transfer Coefficient of High Pressure Water Descaling

2014 ◽  
Vol 599-601 ◽  
pp. 1976-1980
Author(s):  
Peng Gao
Keyword(s):  
Heat Transfer ◽  
Mathematical Model ◽  
High Pressure ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Convective Heat Transfer Coefficient ◽  
Pressure Water ◽  
The Mathematical Model

In order to improving the product quality of hot rolled plate, the iron scale was removed by high pressure water descaling before hot rolling. The billet temperature dropped when a large amount of high pressure water injected on the billet surface. Establishing reasonably mathematical model of temperature field was very important, because it was related to formulate correctly rolling technology. High pressure water descaling convection heat transfer coefficient was an important parameter in the mathematical model of the temperature field. This paper calculated the high pressure water convection heat transfer coefficient by the method of numerical simulation, and regressed the mathematical model of the high pressure water coefficient of convective heat transfer by nonlinear regression method. The author used this mathematical model for finite element analysis in a steel mill, the results showed that the simulation results agreed with the experimental results, the mathematical model of high pressure water descaling convective heat transfer coefficient was reasonable.

Heat Transfer in High-Pressure Metal Hydride Systems

2009 ◽  
Vol 16 (2) ◽  
pp. 189-203 ◽  
Author(s):  
Kyle C. Smith ◽  
Yuan Zheng ◽  
Timothy S. Fisher ◽  
Timothee L. Pourpoint ◽  
Issam Mudawar
Keyword(s):  
Heat Transfer ◽  
High Pressure ◽  
Metal Hydride

Design of the Blast Furnace Wall Structure Made of Efficient Materials. Part 4. Calculation Examples

2020 ◽  
Vol 786 (11) ◽  
pp. 30-34
Author(s):  
A.M. IBRAGIMOV ◽  
◽  
L.Yu. GNEDINA ◽  
Keyword(s):  
Heat Transfer ◽  
Mathematical Model ◽  
Blast Furnace ◽  
Boundary Value Problems ◽  
Transfer Process ◽  
Rational Design ◽  
Boundary Value ◽  
Heat Transfer Process ◽  
Furnace Wall ◽  
Time Interval

This work is part of a series of articles under the general title The structural design of the blast furnace wall from efficient materials [1–3]. In part 1, Problem statement and calculation prerequisites, typical multilayer enclosing structures of a blast furnace are considered. The layers that make up these structures are described. The main attention is paid to the lining layer. The process of iron smelting and temperature conditions in the characteristic layers of the internal environment of the furnace is briefly described. Based on the theory of A.V. Lykov, the initial equations describing the interrelated transfer of heat and mass in a solid are analyzed in relation to the task – an adequate description of the processes for the purpose of further rational design of the multilayer enclosing structure of the blast furnace. A priori the enclosing structure is considered from a mathematical point of view as the unlimited plate. In part 2, Solving boundary value problems of heat transfer, boundary value problems of heat transfer in individual layers of a structure with different boundary conditions are considered, their solutions, which are basic when developing a mathematical model of a non-stationary heat transfer process in a multi-layer enclosing structure, are given. Part 3 presents a mathematical model of the heat transfer process in the enclosing structure and an algorithm for its implementation. The proposed mathematical model makes it possible to solve a large number of problems. Part 4 presents a number of examples of calculating the heat transfer process in a multilayer blast furnace enclosing structure. The results obtained correlate with the results obtained by other authors, this makes it possible to conclude that the new mathematical model is suitable for solving the problem of rational design of the enclosing structure, as well as to simulate situations that occur at any time interval of operation of the blast furnace enclosure.

A mathematical model and an algorithm for sampling sets of components on the Assembly enterprises of space technology

2018 ◽  
Vol 15 (1) ◽  
pp. 39-55
Author(s):  
V. B. Rudakov ◽  
V. M. Makarov ◽  
M. I. Makarov
Keyword(s):  
Mathematical Model ◽  
Mathematical Models ◽  
Space Technology ◽  
Economic Costs ◽  
Problem Statement ◽  
Optimal Plan ◽  
Product Mix ◽  
Technical Parameters ◽  
Complex Products ◽  
Assembly Plants

The article considers the problem of determining the rational plans of the input sampling reliability and technical parameters of components of space technology, the totality of which is supplied to the Assembly plants for the manufacture of complex products of space technology. Problem statement and mathematical model based on the minimization of the economic costs of control and losses related to the risks of taking wrong decisions, are given in the article. The properties of the mathematical models are investigated, the algorithm for its optimization is developed. The result is an optimal plan for the sampling of sets of components, which includes: an optimal product mix subject to mandatory control of the aggregate and optimum risks of first and second kind, when acceptance number of statistical plan is zero. The latter circumstance is due to the high requirements of reliability and technical parameters of products of space technology.

Experimental investigation of wall heat transfer due to spray combustion in a high-pressure/high-temperature vessel

2021 ◽  
pp. 146808742110072
Author(s):  
Karri Keskinen ◽  
Walter Vera-Tudela ◽  
Yuri M Wright ◽  
Konstantinos Boulouchos
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
High Pressure ◽  
High Temperature ◽  
High Speed ◽  
Transfer Problem ◽  
Wall Heat Transfer ◽  
Gas Temperature ◽  
Reference Case ◽  
High Pressure High Temperature

Combustion chamber wall heat transfer is a major contributor to efficiency losses in diesel engines. In this context, thermal swing materials (adapting to the surrounding gas temperature) have been pinpointed as a promising mitigative solution. In this study, experiments are carried out in a high-pressure/high-temperature vessel to (a) characterise the wall heat transfer process ensuing from wall impingement of a combusting fuel spray, and (b) evaluate insulative improvements provided by a coating that promotes thermal swing. The baseline experimental condition resembles that of Spray A from the Engine Combustion Network, while additional variations are generated by modifying the ambient temperature as well as the injection pressure and duration. Wall heat transfer and wall temperature measurements are time-resolved and accompanied by concurrent high-speed imaging of natural luminosity. An investigation with an uncoated wall is carried out with several sensor locations around the stagnation point, elucidating sensor-to-sensor variability and setup symmetry. Surface heat flux follows three phases: (i) an initial peak, (ii) a slightly lower plateau dependent on the injection duration, and (iii) a slow decline. In addition to the uncoated reference case, the investigation involves a coating made of porous zirconia, an established thermal swing material. With a coated setup, the projection of surface quantities (heat flux and temperature) from the immersed measurement location requires additional numerical analysis of conjugate heat transfer. Starting from the traces measured beneath the coating, the surface quantities are obtained by solving a one-dimensional inverse heat transfer problem. The present measurements are complemented by CFD simulations supplemented with recent rough-wall models. The surface roughness of the coated specimen is indicated to have a significant impact on the wall heat flux, offsetting the expected benefit from the thermal swing material.

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