Study of the Influence of Sugar Solution Concentration on the Intensity of Heat Exchange, Using the Regular Heat Mode Method
DOI:
https://doi.org/10.31649/1997-9266-2023-169-4-16-24Keywords:
intensity of heat exchange, sugar solution, cooling rate, experimental and calculation method, regular thermal modeAbstract
In power industry branch of national economy , forecasting of the heat exchange intensity is of great importance, since it enables to calculate and select equipment, especially when information on the thermophysical properties of liquid media is partially unknown.
The work examines the system "environment (water in an annular volume) — thin cylindrical metal wall — investigated liquid medium (sugar solution)". Heat exchange during heating and cooling of a sugar solution with a mass concentration of dry substances of 20 % and 70 % under conditions of forced convection is studied.
It was established that in the studied liquid medium (sugar solution) signs of a regular thermal mode occur (RTM), namely: the rate of cooling (heating) of the sugar solution m = const; coefficient of heat transfer from the medium (water) to the thin-walled metal cylinder α1 ≈ const; coefficient of uneven temperature distribution is const.
In the literature, the existence of a regular thermal mode is known only for the solid bodies and systems of solid bodies. In the previous works of the authors, signs of a regular thermal mode in the "liquid-solid" system were investigated.
The calculation-experimental method is used to determine the heat transfer coefficient between the internal thin-walled vessel and the medium under the study. For the prediction of the heat exchange, the regular thermal mode method was applied .
The research is carried out on an experimental stand, which is a component of the experimental-calculation method under conditions of forced convection. The ratio of the diameters of the stirrer and the inner vessel d/D = 0.6. The range of adjustment of the frequency of revolutions of the stirrer is 26...150 rpm. Measurement of temperatures in the working volumes during the experimental study is carried out using vertically installed thermocouples in ten points.
Using signs of the existence of a regular thermal mode , the analysis of the influence of sugar solution concentration on the intensity of heat exchange is carried out.
References
Теплообмінники для цукрової промисловості. [Electronic resource]. Available: https://termoprom.com.ua/uk/heat-exchangers-sugar-industry . Accessed on: April 10, 2023.
Plate Heat Exchanger For Sugar. [Electronic resource]. Available: https://www.hofmann-heatexchanger.com /solutions/plate-heat-exchanger-for-sugar . Accessed on: April 12, 2023.
Heat exchangers for sugar factories and distilleries [Electronic resource]. Available: https://www.barriquand.com/en/heat-exchangers-applications/heat-exchangers-agro-industriy/heat-exchangers-sugar-ethanol/ . Accessed on: April 18, 2023.
Plate Heat Exchanger For Sugar [Electronic resource]. Available: https://www.hofmann-heatexchanger.com /solutions/plate-heat-exchanger-for-sugar . Accessed on: April 18, 2023.
S. Тkachenko, O. Vlasenko, N. Resident, D. Stepanov, and N. Stepanova. “Cooling and of the fluid in the cylindrical volume,” Acta Innovations, no. 42, 15-26, 2021. https://doi.org/10.32933/ActaInnovations.42.2 .
С. Ткаченко, О. Власенко, i Н. Резидент, «Теплообмін циліндричного рідинного тіла обмеженої висоти з навколишнім середовищем,» Вісник Національного технічного університету «ХПІ». Серія: Енергетичні та теплотехнічні процеси й устаткування, № 2, с. 27-30, 2021. https://doi.org/10.20998/2078-774X.2021.02.05 .
С. Й. Ткаченко, і О. В. Власенко, «Дослідження темпу нагрівання гетерогенного рідкого середовища,» Сучасні технології матеріали і конструкції в будівництві, № 1, 127-133, с. 2019. https://doi.org/10.31649/2311-1429-2019-1-127-133 .
О. В. Власенко, «Дослідження теплообміну в об’ємі двофазної рідини за умов вимушеної конвекції,» Вісник Вінницького політехнічного інституту, № 6, с. 14-20, 2022. https://doi.org/10.31649/1997-9266-2021-159-6-14-20 .
А. І. Погорєлов, Тепломасообмін (основи теорії і розрахунку), навч. посіб. для вузів, 2-ге вид. Львів: Новий Світ-2000, 2004.
С. Й. Ткаченко, О. В. Власенко, Н. Д. Степанова, і Є. О. Павлович, «Нестаціонарний теплообмін у вертикальному циліндричному об’ємі, заповненому рідиною,» Вісник Вінницького політехнічного інституту, № 1, с. 16-20, 2022. https://doi.org/10.31649/1997-9266-2022-160-1-16-20
Downloads
-
PDF (Українська)
Downloads: 110
Published
How to Cite
Issue
Section
License
This work is licensed under a Creative Commons Attribution 4.0 International License.
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgment of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
