Academic Journal
Convective Heat Exchange of Single-Row Bundles from Tubes with Rolled Aluminum Fins of Various Height at a Low Values of the Reynolds Number
| العنوان: | Convective Heat Exchange of Single-Row Bundles from Tubes with Rolled Aluminum Fins of Various Height at a Low Values of the Reynolds Number |
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| المؤلفون: | A. B. Sukhotski, Е. S. Danil’chik |
| المصدر: | Izvestiâ Vysših Učebnyh Zavedenij i Ènergetičeskih ob Edinennij SNG. Ènergetika, Vol 64, Iss 4, Pp 336-348 (2021) |
| بيانات النشر: | Belarusian National Technical University, 2021. |
| سنة النشر: | 2021 |
| المجموعة: | LCC:Hydraulic engineering LCC:Engineering (General). Civil engineering (General) |
| مصطلحات موضوعية: | bimetallic finned tube, single-row tube heat exchanger, dimensional and metalintensive characteristics, exhaust shaft, low reynolds numbers, nusselts number, the criteria equation of a heat transfer, Hydraulic engineering, TC1-978, Engineering (General). Civil engineering (General), TA1-2040 |
| الوصف: | The experimental study of the heat flow intensity of a single-row horizontal air-cooled tubular bundle of heat exchanger with spiral aluminum rolling fins at low Reynolds numbers (Re < 2000) is performed. The geometrical dimensions of the bimetallic finned tubes of the bundle, the following: the outer diameter of the fins d = 56.0 mm; the diameter of the tube at the base d0 = 26.8 mm; fin height h = 14.6 mm; pitch of fins s = 2.5 mm; the average fin thickness Δ = 0.5 mm; the coefficient of finned tubes φ = 19.3; heat transfer length l = 300 mm. The outer diameter of the load-bearing steel tube dн = 25 mm; wall thickness d = 2 mm. The research was carried out by the method of full thermal modeling at a specially designed experimental stand with electric heating of tubes and an exhaust shaft installed above the bundle. The air flow rate through the bundle was regulated by changing the height and cross-sectional area of the exhaust shaft. Calibration experiments were carried out and confirmed the reliability of the data obtained. Then the fins were sanded so to form new types of tubes, which were arranged in a single-row six-tube bundle with a constant relative cross-step σ1 = S1/d = 1.14 = const, and the thermal studies were repeated. As a result, a generalized criterion equation for heat transfer of a finned horizontal single-row bundle at small Reynolds numbers for various heights of the tube finning h = 0-14.6 mm was obtained. The effective height of the tube finning (h = 8 mm) for a single-row horizontal bundle was determined by dimensional and metal-intensive criteria. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | Russian |
| تدمد: | 1029-7448 2414-0341 |
| Relation: | https://energy.bntu.by/jour/article/view/2085; https://doaj.org/toc/1029-7448; https://doaj.org/toc/2414-0341 |
| DOI: | 10.21122/1029-7448-2021-64-4-336-348 |
| URL الوصول: | https://doaj.org/article/6d456125da2e4cc1b70bd2a790de3330 |
| رقم الانضمام: | edsdoj.6d456125da2e4cc1b70bd2a790de3330 |
| قاعدة البيانات: | Directory of Open Access Journals |
| تدمد: | 10297448 24140341 |
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| DOI: | 10.21122/1029-7448-2021-64-4-336-348 |