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Vibrations in engineering and technology

space SCIENTIFIC JOURNALS OF VINNITSA NATIONAL AGRARIAN UNIVERSITY

Issue №: 3 (102)

Published: 2021.09.28
DOI: 10.37128/2306-8744-2021-3


Description:
The journal deals with the problems of vibration technologies and machines, mathematical methods of vibration process studies, information on design and technological development, presents teaching and methodological aspects of teaching in the Higher School of Applied Sciences, where vibration machines and technologies are studied.

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DETERMINING THE THERMO PHYSICAL CHARACTERISTICS OF VIBRATION DRYING OBJECTS

DOI: 10.37128/2306-8744-2021-3-11
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Tsurkan Oleh – Doctor of Technical Sciences, Associate Professor, Director of Separate structural subdivision «Ladyzhyn vocational college of Vinnytsia National Agrarian University» (Kravchik Petro St., 5, Ladyzhyn, Vinnytsia Region, Ukraine, 24321, e-mail: tsurkan_ov76@ukr.net).

Spirin Anatoly - candidate of technical sciences, associate professor, teacher of Separate structural subdivision «Ladyzhyn vocational college of Vinnytsia National Agrarian University» (Kravchik Petro St., 5, Ladyzhyn, Vinnytsia Region, Ukraine, 24321, e-mail: spirinanatoly16@gmail.com.

Tverdokhlib Igor – candidate of technical sciences, associate professor of the department of general technical disciplines and occupational safety, Vinnytsia National Agrarian University: Vinniytsia, st. Sonyachna 3, VNAU, 21008, e-mail: igor_tverdokhlib@yahoo.com.

Annotation

Crop products require good moisture content for successful storage. The drying process is mainly used for this purpose. For its successful design and implementation it is necessary to have information about the physical and mechanical properties of the material, including thermo physical characteristics. It is for the successful implementation of the process of post-harvest processing of pumpkin seeds were planned and conducted experimental studies.

Analysis of previous studies to determine the thermo physical characteristics of various materials, including plant products, showed that in most cases one series of experiments to determine three main indicators - heat capacity, thermal conductivity and thermal conductivity of products. Unfortunately, there is no universal method and installation for determining the required indicators, so in our research we used the original installation, the principle of which is based on the use of non-stationary heating patterns of two semi-bounded rods, where the source of heat is constant power.

The theoretical basis of the implemented method is the solution and analysis of the thermal equation with the corresponding boundary conditions. Intermediate equations were obtained from which the values of thermal conductivity and thermal conductivity for each series of experiments were found by the graph-analytical method of solution. The value of heat capacity of the material was determined from the well-known formula of the ratio of these three indicators. As a result of research and processing of the obtained data, the dependences of the thermo physical properties of the material on its humidity were determined, which are presented in graphical and analytical form. The obtained dependences confirmed the results of researches of some authors on the presence of inflection in the graph of thermal conductivity which is explained by the transition of moisture from free to bound state.

Keywords: pumpkin seeds, thermal conductivity, heat capacity, thermal conductivity, thermocouple.

List of references

1. A.G. Korotkikh. (2011). Teploprovodnost' materialov. [Thermal conductivity of materials]. Uchebnoye posobiye Tomskogo politekhnicheskogo universiteta. [in Russian].

2. N.A. Podledneva, V.A. Krasnov, R.S. Magomedov. (2013). Opredeleniye koeffitsiyentov teploprovodnosti i temperaturoprovodnosti za odin opyt metodom lineynogo istochnika teploty postoyannoy moshchnosti. [Magomedov Determination of the coefficients of thermal conductivity and thermal diffusivity in one experiment by the method of a linear heat source of constant power ] Vestnik Astrakhanskogo GTU. [in Russian].

3. Golovin D.YU., Divin A.G., Samodurov A.A. i dr. (2020). Novyy ekspress-sposob opredeleniya koeffitsiyenta temperaturoprovodnosti materialov i gotovykh izdeliy. [A new express method for determining the thermal diffusivity of materials and finished products ]. Inzhenerno-fizicheskiy zhurnal. [in Russian].

4. Golovin D.YU., Tyurin A.I., Samodurov A.A., Golovin YU.I. (2020). Opredeleniye temperaturoprovodnosti materialov metodom nestatsionarnogo tochechnogo nagreva. [Determination of thermal diffusivity of materials by the method of non-stationary point heating] Pis'ma v Zhurnal tekhnicheskoy fiziki. [in Russian].

5. Ivanchenko V.I., Modonkayeva A.E., Yalpachik V.F., Struchayev K.N., Zagorko N.P. (2001). Opredeleniye koeffitsiyenta teploprovodnosti plodoovoshchnoy produktsii pri zamorazhivanii. [Determination of the coefficient of thermal conductivity of fruits and vegetables during freezing]. Khraneniye i pererabotka sel'khozsyr'ya. [in Russian].

6. Yalpachyk V.F., Struchaev M.I., Tarasenko V.H. (2015). Eksperymentalʹne vyznachennya koefitsiyenta teploprovidnosti pry zamorozhuvanni. [Experimental determination of the coefficient of thermal conductivity during freezing of Labor].Pratsi. TDATU. [in Ukrainian].

7. Tsuglenok N.V., Manasyan S.K., Demskiy N.V., Konusov N.N. (2007). Metodika opredeleniya teplofizicheskikh svoystv zernovogo materiala. [Methods for determining the thermophysical properties of grain material]. Vestnik Krasnoyarskogo GAU. [in Russian].

8. A.F. Erk, A.N. Perekopskiy, S.V.Chugunov. (2017) Teplofizicheskiye kharakteristiki semyan trav. [Thermophysical characteristics of grass seeds]. Teoreticheskiy i nauchno-prakticheskiy zhurnal IAEP. [in Russian].

9. Butova S.V., Sedova O.S. (2019). Analiz teplofizicheskikh svoystv semyan maslichnykh kul'tur. [Analysis of thermophysical properties of oilseeds]. Materialy mezhdunarodnoy nauchno-tekhnicheskoy konferentsii "Problemy sovershenstvovaniya mashin, oborudovaniya i tekhnologiy v agropromyshlennom komplekse". Voronezhskiy GAU. [in Russian].

10. N.M. Osokina, K.V. Kostetsʹka. (2013). Fizychni i teplofizychni vlastyvosti ovochiv zalezhno vid sortu ta stupenya styhlosti. [Physical and thermophysical properties of vegetables depending on the variety and degree of ripeness]. Zbirnyk naukovykh pratsʹ Umansʹkoho natsionalʹnoho universytetu sadivnytstva. [in Ukrainian].

11. Verzhinskaya A.B., Novichenok L.N. (1960). Novyy universal'nyy metod opredeleniya teplofizicheskikh koeffitsiyentov. [A new universal method for determining thermophysical coefficients]. Inzhenerno-fizicheskiy zhurnal. [in Russian].

12. Verzhinskaya A.B. (1962) Metod istochnika postoyannoy moshchnosti. [Constant power source method]. V kn. Teplo- i massoperenos. Minsk. Iz-vo AN BSSR. [in Belarus].

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About journal

Topics of the journal:

The journal "Vibrations   in engineering  and technology" presents materials on the following issues

• Theory of processes and machines
• Mechanical Engineering and materialprocessing
• Processing and food production

Key information:
ISSN (print): 2306-8744
DOI: 10.37128/2306-8744

The certificateof massmediaState registration:kv no 16643-5115 from 30.04.2010 .
Founder of the journal: Vinnytsia National Agrarian University

Kind of publication: journal
Type of publication : Scientific
Publication status: Domestic
Year of founding:
Periodicity: 4 times a year
Extent: 18.75 nominal printed pages
ISSN: 2306-8744 (printed version), (online)
Language of edition  : (mixed languages) Ukrainian, English
The scope of the distribution and the category of readers: national, foreign, teaching staff, scientists, businessmen.
Periodical is included in the list of scientific professional editions of Ukraine approved by the Order of Ministry of Education and Sciences of Ukraine from 21.12.2015 No. 1328.
The journal "Vibrations in engineering and technology" is included in the "Catalogue of periodicals of Ukraine".
Journal subscription can be executed in each post office department.
 Subscription Index is  99720.

 

Old version of site: http://vibrojournal.vsau.edu.ua/

History of journal:

In June 1994 the 2nd International Scientific and Technical Conference "Application of vibrations for technological purposes" was organized on the basis of Vinnytsia State Agricultural Institute. Leading experts in this field, noting the significant contribution to the school of Vibration Engineering under the leadership of P. S. Bernyk, proposed to create a professional all-Ukrainian scientific and technical journal "Vibration in engineering and technology..The journal was foundedat Vinnytsia State Agricultural Institute and P.S. Bernyk was elected to be the chief editor .
For all these years (since 1994) theJournal "vibration in engineering and technology" published  94 issues wherestudy of vibration effects, the creation of progressive energy saving technologies and equipment for their implementation were highlighted.
Currently Kaletnik H.M  PhD , professor, academician NAAS is the chief editor of the "Vibrations in engineering  and Technology"
The journal "Vibration in Engineering and technology", which has no analogues on the territory of Ukraine, is well known abroad.