THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

Authors of this Paper

External Links

online first only

A theoretical model of natural circulation flow and heat transfer within one-ended inclined pipe

ABSTRACT
The most commonplace natural flow inside one-ended inclined pipes today is water heating systems. In this study, a model was created for the estimation of the pipe outlet temperature of the fluid with the energy balance for the inside of the tank, flow rate calculation of natural circulation, and other thermal calculations in a one-ended inclined pipe. In addition, this model has been compared with the Li model in the literature, and it is easier and more successful. 100, 200, 400, 600, and 800 W thermal power was applied to a one-ended inclined pipe, and the temperature values were recorded in 5-minute periods in the experiments that lasted a total of 6 hours. As the average of the experiments, the estimation results for the current model and the Li model are as follows: The average percent relative error rates are 6.02 and 15.1 and the coefficient of determination (R2) are 0.9865 and 0.9683, respectively.
KEYWORDS
PAPER SUBMITTED: 2022-04-02
PAPER REVISED: 2022-04-28
PAPER ACCEPTED: 2022-04-30
PUBLISHED ONLINE: 2022-07-09
DOI REFERENCE: https://doi.org/10.2298/TSCI220402100B
REFERENCES
  1. Malkin, P. M., Design of Thermosyphon Solar Domestic Hot Water Systems, M. S. thesis, University of Wisconsin, Madison, Wisconsin 1985
  2. Akanmu, W. P., Bajere, P. A., Investigation of Temperature and Flow Distribution in A Serially Connected Thermosyphon Solar Water Heating Collector System, Journal of Energy Technologies and Policy, 5 (2015), 2, pp. 56-68
  3. Li, J., et al., A Theoretical Model of Natural Circulation Flow and Heat Transfer Within Horizontal Evacuated Tube Considering the Secondary Flow, Renewable Energy, 147 (2020), pp. 630-638, DOI No. 10.1016/j.renene.2019.08.135
  4. Pleshanov, K. A., et al., Design of A Natural Circulation Circuit for 85 MW Steam Boiler, Thermal Science, 21 (2017), 3, pp. 1503-1513, DOI No. 10.2298/TSCI161005320P
  5. Bejjam, R. B., Kiran, K. K., Numerical Study on Heat Transfer Characteristics of Nanofluid Based Natural Circulation Loop, Thermal Science, 22 (2018), 2, pp. 885-897, DOI No. 10.2298/TSCI160826087B
  6. Riahi, A., Taherian, H., Experimental Investigation on The Performance of Thermosyphon Solar Water Heater in The South Caspian Sea, Thermal Science, 15 (2011), 2, pp. 447-456, DOI No. 10.2298/TSCI1102447R
  7. Bocanegra, J. A., et al., Thermal Performance Investigation of a Mini Natural Circulation Loop for Solar PV Panel or Electronic Cooling Simulated by Lattice Boltzmann Method, International Journal of Energy Production and Management, 7 (2022), 1, pp. 1-12
  8. Misale, M., et al., Thermo-Hydraulic Performance of Connected Single-Phase Natural Circulation Loops Characterized by Two Different Inner Diameters, International Communications in Heat and Mass Transfer, (2021) 125, 105309, DOI No. 10.1016/j.icheatmasstransfer.2021.105309
  9. Wang, W., et al., Analysis and Correlation of Fluid Motions in Natural Thermal Convection in a Cylindrical Vessel, Thermal Science, 23 (2019), 3, pp. 859-865, DOI No. 10.2298/TSCI180605121W
  10. Budihardjo, I., et al., Natural Circulation Flow-Through Water-In-Glass Evacuated Tube Solar Collectors, Solar Energy, 81 (2007), 12, pp. 1460-1472, DOI No. 10.1016/j.solener.2007.03.002
  11. Lighthill, M. J., Theoretical Considerations on Free Convection in Tubes, The Quarterly Journal of Mechanics and Applied Mathematics, 6 (1953), 4, pp. 398-439, DOI No. 10.1093/qjmam/6.4.398
  12. Leslie, F. M., Free Convection in The Tilted Open Thermosyphon, Journal of Fluid Mechanics, 7 (1960), 1, pp. 115-127, DOI No. 10.1017/S0022112060000074
  13. Hasegawa, S., et al., Heat Transfer in An Open Thermosyphon, Bulletin of JSME, 6 (1963), 22, pp. 230-250, DOI No. 10.1299/jsme1958.6.230
  14. Martin, B. W., Cohen, H., Heat Transfer by Free Convection in An Open Thermosyphon Tube, British Journal of Applied Physics, 5 (1954), 3, pp. 91-95
  15. Behnia, M., Morrison, G. L., An Experimental Investigation of Inclined Open Thermosyphons, Solar Energy, 47 (1991), 4, pp. 313-326, DOI No. 10.1016/0038 092X(91)90124-F
  16. Kline, S. J., McClintock, F. A., Describing Uncertainties in Single Sample Experiments, Mech Eng, 75 (1953), 1, pp. 3-8
  17. ***, Mobil Oil Turkey, www.mobiloil.com.tr/tr-tr/industrial-products/mobiltherm-605