Determination of the characteristics of nonsteady heat exchange in one disperse reactive system

1978 ◽  
Vol 35 (6) ◽  
pp. 1429-1435
Author(s):  
A. M. Grishin ◽  
G. S. Loskutov ◽  
T. S. Sandrykina
Keyword(s):  
Heat Exchange ◽  
Reactive System ◽  
Nonsteady Heat

Nonsteady heat exchange during pulsating laminar flow of a viscous liquid in an annular channel

1979 ◽  
Vol 19 (5) ◽  
pp. 666-669
Author(s):  
S. G. Ivanushkin ◽  
V. I. Kondrashov ◽  
V. E. Tomilov
Keyword(s):  
Heat Exchange ◽  
Laminar Flow ◽  
Viscous Liquid ◽  
Annular Channel ◽  
Nonsteady Heat

Cyclic voltammetric determination of glutamic-pyruvic transaminase activity based on transdeamination

2015 ◽  
Vol 7 (22) ◽  
pp. 9421-9425 ◽  
Author(s):  
Zheng Xu ◽  
Shuai-long Hu ◽  
Wei-fang Tian ◽  
Da-zhi Wang ◽  
Jun-shan Liu ◽  
...  
Keyword(s):  
Electrochemical Detection ◽  
Voltammetric Determination ◽  
Reactive System ◽  
Glutamic Pyruvic Transaminase ◽  
Transaminase Activity ◽  
Cyclic Voltammetric

We propose a new enzymatic reactive system based on transdeamination for the electrochemical detection of glutamic-pyruvic transaminase activity.

scholarly journals Determination of Heat Exchange Law Using Mean Isotherm

2020 ◽  
Vol Volume 14 ◽  
Keyword(s):  
Temperature Field ◽  
Heat Exchange ◽  
Heat Flow ◽  
Heat Exchange Coefficient ◽  
Main Attention ◽  
One Dimensional ◽  
Mean Temperature ◽  
Inverse Heat Transfer ◽  
Transfer Problems

Determination of heat exchange between a solid and the environment is a significant inverse thermal physical problem. This heat exchange law irrespective of its nature can be defined easier if mean temperature of such solid is known. When mean temperature of the solid and speed of its change are known, it becomes possible to determine heat flow on the boundary of the solid. In its turn, when heat flow on the boundary, temperature on the boundary and ambient temperature are defined, heat exchange coefficient can be established. Therefore, the main attention is paid to a manner how mean temperature of a solid can be determined in the article. Examining inverse heat transfer problems, input data consist of measurements taken in temperature field as simple as possible mathematically in laboratory conditions. Hence, a symmetrical one-dimensional temperature field is discussed in the article

Numerical Modeling of Heat and Mass Transport with Inner Heat Exchange in Unsaturated Porous Media

2020 ◽  
Vol 27 ◽  
pp. 166-176
Author(s):  
Jozef Kačur ◽  
Patrik Mihala
Keyword(s):  
Mathematical Model ◽  
Porous Media ◽  
Heat Exchange ◽  
Inverse Problems ◽  
Water Transport ◽  
Heat Conductivity ◽  
Unsaturated Porous Media ◽  
Heat Transmission ◽  
Matrix Heat

We are focused to the numerical modelling of heat, contaminant and water transport in unsaturated porous media in 3D. The heat exchange between water and porous media matrix is taken into the account. The determination of heat energy transmission coefficient and matrix heat conductivity is solved by means of inverse problem methods. The mathematical model represents the conservation of heat, contaminant and water mass balance. It is expressed by coupled non-linear system of parabolic-elliptic equations. Mathematical model for water transport in unsaturated porous media is represented by Richard's type equation. Heat transport by water includes water flux, molecular diffusion and dispersion. A successful experiment scenario is suggested to determine the required parameters including heat transmission and matrix heat conductivity coefficients. Additionally we investigate contaminant transport with heat transmission and contaminant adsorption. The obtained experiments support our method suitable for solution of direct and inverse problems. This problem we have discussed previously in 1D model, but preferential streamlines in 1D thin tubes shadow accurate results in determination of required parameters. In our presented setting we consider a cylindrical sample which is suitable in laboratory experiments for inverse problems.

Unventilated Air Layers with a Reflective Coating in the Building Envelope

2018 ◽  
Vol 931 ◽  
pp. 496-501 ◽  
Author(s):  
Nina P. Umnyakova ◽  
Adam Ujma
Keyword(s):  
Heat Exchange ◽  
Thermal Insulation ◽  
Building Envelope ◽  
Radiative Heat Exchange ◽  
Aluminium Foil ◽  
Reflective Coating ◽  
Air Layers ◽  
Design Calculations ◽  
Reflective Coatings

Heat exchange through infrared radiation in air layers located inside building envelopes may be significantly modified in case of use of aluminium foil coatings therein. The intensity of conductive, convective and radiative heat exchange in these structures depends on the thickness of the air layer and the temperature difference on its surfaces. Generally speaking, application of aluminium foil in air layers of a building envelope improves its thermal insulation capacity. However, assessment of efficiency of such a solution and determination of the thermal resistance value of a given structure is often incorrectly determined and assumed for design calculations. The article analyzes the instructions and principles of determination of thermal insulation capacity of unventilated air layers. Provisions of two standards have been compared with results of tests of air layer parameters. The effect of different factors on heat exchange and insulation capacity of air layers with reflective coatings has been considered and assessed.

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