Utilization of criterial equations for quantitative processing of thermogravimetric results

1988 ◽  
Vol 34 (3) ◽  
pp. 761-767 ◽  
Author(s):  
S. V. Karachinsky ◽  
O. Yu. Peshkova ◽  
V. V. Dragalov ◽  
A. L. Chimishkyan
Keyword(s):  
Criterial Equations

STUDY OF EXTERNAL MASS TRANSFER DURING DRYING OF BERRY RAW MATERIALS TAKING INTO THE SHRINKAGE PHENOMENON

2019 ◽  
Author(s):  
А.В. АКУЛИЧ ◽  
Л.А. ГОСТИНЩИКОВА
Keyword(s):  
Mass Transfer ◽  
Energy Supply ◽  
Raw Materials ◽  
Mass Transfer Rate ◽  
Experimental Studies ◽  
Volume Shrinkage ◽  
External Mass Transfer ◽  
Transfer Coefficients ◽  
Ir Radiation ◽  
Criterial Equations

Исследованы закономерности внешнего массообмена при сушке ягодного сырья для различных способов энергоподвода. Установлено, что ягоды при сушке подвержены значительной объемной (72–81%) и линейной (35–43%) усадке, которую необходимо учитывать при расчете коэффициентов массоотдачи. Объекты исследования – ягоды черники, красной и черной смородины. Проведены экспериментальные исследования по сушке ягодного сырья при конвективном и конвективном с ИК-излучением способах энергоподвода. Исследования проведены при скорости сушильного агента хса1,2 м/с и температуре tса 70°С. Получены критериальные уравнения внешнего массоообмена при сушке ягод для периода постоянной скорости, учитывающие объемную усадку. Определено, что при сушке с конвективным энергоподводом объемная усадка при одном и том же значении критерия Рейнольдса оказывает на 12–20% большее влияние на интенсивность массоообмена для красной смородины по сравнению с черникой и черной смородиной. При сушке с конвективным энергоподводом, ИК-излучением и предварительным прокалыванием объемная усадка наиболее существенно влияет на массообмен для черной смородины, протекающий в 1,5–1,8 раза интенсивнее по сравнению с черникой и красной смородиной. Полученные критериальные уравнения могут быть использованы при расчете и проектировании установок для сушки ягодного сырья. The laws of external mass transfer during drying of berry raw materials for various methods of energy supply are investigated. It is established that the berries during drying are subject to significant volumetric (72–81%) and surface (35–43%) shrinkage, which must be taken into account when calculating the mass transfer coefficients. The objects of the study were various berries: blueberries, red and black currants. Experimental studies have been carried out on the drying of selected berries both in the case of convective and convective methods with IR radiation. Investigations were carried out at a drying agent velocity хса1,2 m/s and its temperature tca70°С. The criterion equations of external mass transfer during drying of berries for a period of constant speed, taking into account the volume shrinkage, are obtained. It was determined that during drying with convective energy supply, volume shrinkage with the same value of the Reynolds criterion on 12–20% has a greater effect on the mass transfer rate for red currants. When drying with convective energy supply, IR radiation and preliminary piercing, the volume shrinkage most significantly affects the mass transfer for black currants, which is 1,5–1,8 times more intense than blueberries and red currants. The obtained criterial equations can be used in the calculation and design of berries dryers.

Some Aspects of Improving the Efficiency of Air Treatment in the Contact Units of HVAC Systems

2017 ◽  
Author(s):  
Alexander Gvozdkov ◽  
Olga Suslova
Keyword(s):  
Energy Efficient ◽  
Experimental Studies ◽  
Water System ◽  
Hvac Systems ◽  
Moisture Exchange ◽  
Air Treatment ◽  
Working Space ◽  
Transition Area ◽  
Criterial Equations ◽  
Heat And Moisture

One of the main issues of improving the efficiency of air treatment in ventilation and air conditioning systems (HVAC systems) is development of methodology for the realization of energy-efficient air treatment processes in the contacting units. This paper investigates the thermodynamic models of “air-water” system, considering some features of the transition area at the interface, including surface phases and boundary layers of air and water. It has a great impact on the efficiency of processes of heat and moisture exchange in the contact units HVAC systems. The paper presents the results of experimental studies to determine the air-water interfaces temperature when achieving a state of thermodynamic balance condition in contacting media (air and water) in the working space of contact units. It was found that the surface temperature is determined by state of the surface phase and depends on the direction process of heat and moisture exchange (condensation or evaporation). The temperature factor k = Tdry/Ts as a criterion for determining the effect of the state transition area on the processes of heat and moisture exchange, was used. Processing of results from experimental researches in the processes of heat and mass transfer is presented in the form of criterial equations for Nu, Nu. Results of the performed research are the basis for the formulation of theoretical ideas about the energy efficient processes and the development of a new method for calculation of the contact units HVAC systems.

Calculation of the Geometrical Parameters of the Heat Exchanger Type “Pipe in Pipe” with a Spiral-Coiled Channel

2019 ◽  
Vol 16 (11) ◽  
pp. 4513-4518 ◽  
Author(s):  
Valeriya Leonidovna Vorontsova ◽  
Alfiya Gizzetdinovna Bagoutdinova ◽  
Almaz Fernandovich Galemzianov
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Heat Exchangers ◽  
Characteristic Size ◽  
Geometrical Parameters ◽  
Equivalent Diameter ◽  
Annular Space ◽  
Integral Calculus ◽  
Criterial Equations ◽  
Type Tube

The designs of the modern type of twisting devices include spring-twisted channels, which to use as innovative heat exchange elements of tubular apparatuses. The paper presents a method for determining the equivalent diameter of the tube and intertubular space in a heat exchanger apparatus of the type “tube-in-tube” with a spring-twisted channel which composed of tori closely adjacent to each other. Based on the integral calculus, formulas are obtained for calculating the equivalent diameters of the tube and annular space in a tube-in-tube apparatus with a spring-twisted channel. The results of experiments on heat transfer are generalized by criterial equations, in which the equivalent diameter is used as the characteristic size. It is shown that the equivalent diameters of the examined channels differ from each other by no more than 5%. The results of this work can be used in the design and calculations of promising heat exchangers with intensified heat transfer.

Determination of parameters of artificial constructional conglomerates using criterial equations

1980 ◽  
Vol 39 (1) ◽  
pp. 809-812
Author(s):  
V. N. Evstifeev ◽  
L. S. Evstifeeva
Keyword(s):  
Criterial Equations ◽  
Determination Of Parameters

scholarly journals DEVELOPMENT AND JUSTIFICATION OF PARAMETERS OF THE CENTRIFUGAL INSTALLATION FOR THERMAL PROCESSING OF BOILER WASTES

2017 ◽  
Vol 12 (2) ◽  
pp. 81-87
Author(s):  
Георгий Жданкин ◽  
Georgiy Zhdankin ◽  
Владимир Сторчевой ◽  
Vladimir Storchevoy ◽  
Галина Новикова ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Thermal Processing ◽  
Raw Materials ◽  
Liquid Fraction ◽  
Operating Conditions ◽  
Animal Origin ◽  
Regression Equations ◽  
Technological Parameters ◽  
Criterial Equations ◽  
Protein Feed

On the basis of the criterial equations, regression equations are obtained, that allow to evaluate the influence of technological parameters, electrophysical and physico-mechanical properties of non-food raw materials on the duration of heat treatment and disinfection of protein feed and to determine the rational operating conditions of a multimodular centrifugal microwave plant for heat treatment of non-food wastes of animal origin and separation of the liquid fraction.

Criterial equations for the design of rotary seals operating under semi-dry friction conditions

1966 ◽  
Vol 1 (2) ◽  
pp. 107-110
Author(s):  
G. Shkurupii ◽  
L. Mamon ◽  
M. Lokshin
Keyword(s):  
Dry Friction ◽  
Criterial Equations
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