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Abstract

The paper presents investigation into the single water microjet surface cooling producing evaporating film. Reported tests were conducted under steady state conditions. Experiments were conducted using the nozzle size of 70 and 100 μm respectively. In the course of investigations obtained were experimental relations between heat flux and wall superheating. It was proved that the phenomenon is similar to that of pool boiling but the boiling curves are showing a smaller value of critical heat flux (CHF) that the stagnant pool boiling. Values of CHF are also reduced with decreasing liquid subcooling. Theoretical model of surface cooling by evaporating microjet impingement in the stagnation point was described theoreticaly. Results of experiments were compared with predictions by the model showing a good consistency.
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Authors and Affiliations

Dariusz Mikielewicz
Jarosław Mikielewicz
Tomasz Muszyński
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Abstract

Boiling produces vapor with a phase change by absorbing a consistent amount of heat. Experimentation and modeling can help us better understand this phenomenon. The present study is focused on the heat transfer during the nucleate pool boiling of refrigerant R141b on the surface of a horizontal copper tube. The results of the experiment were compared with four correlations drawn from the literature, and the critical heat flux was examined for different pressures and also compared with the predicted values. Simulating boiling with two-phase models allowed us to infer the plot of the temperature distribution around the tube and compared it to results from other work.
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Bibliography

[1] V.K. Dhir. Nucleate and transition boiling heat transfer under pool and external flow conditions. International Journal of Heat and Fluid Flow, 12(4):290–314, 1991. doi: 10.1016/0142-727X(91)90018-Q.
[2] I.L. Pioro, W. Rohsenow, and S.S. Doerffer. Nucleate pool-boiling heat transfer. I: review of parametric effects of boiling surface. International Journal of Heat and Mass Transfer, 47(23):5033–5044, 2004. doi: 10.1016/j.ijheatmasstransfer.2004.06.019.
[3] T. Baki and A. Aris. Etude expérimentale du transfert de chaleur lors de l’ébullition en vase du R141b. (Experimental study of heat transfer during the pool boiling of R141b). Communication Science & Technology, No. 11, July 2012 COST (in French).
[4] T. Baki, A. Aris, and A. Guessab. Impact du diamètre extérieur d’un tube horizontal lors de l’ébullition en vase. (Impact of the outside diameter of a horizontal tube during pool boiling). In 12th Mechanical Congress, 21-24 April 2015, Casablanca, Marocco (in French).
[5] T. Baki, A. Aris, and M. Tebbal. Proposal for a correlation raising the impact of the external diameter of a horizontal tube during pool boiling. International Journal of Thermal Sciences, 84:293–299, 2014. doi: 10.1016/j.ijthermalsci.2014.05.023.
[6] T. Baki. Etude expérimentale et simulation de l’ébullition à l’extérieur d’un tube horizontal. (Experimental study and simulation of boiling outside a horizontal tube). Ph.D. Thesis, University of Sciences and Technology of Oran Mohamed Boudiaf (USTO-MB), Oran, Algeria. (in French).
[7] T. Baki. Ebullition à l’Extérieur d’un Tube Horizontal, Comparaison de Corrélations. (Boiling outside a horizontal tube, comparison of correlations). In National Congress on Energies and Materials (CNEM), December 17-18, 2018, Naâma Algeria (in French).
[8] T. Baki. Ebullition à l’extérieur d’un Tube Horizontal à des Pressions sous Atmosphérique, Comparaison de Corrélations. (Boiling outside a horizontal tube under atmospheric pressures, comparison of correlations). In: 1st International Symposium on Materials, Energy and Environment – MEE'2020, January 20-21, 2020, El Oued, Algeria (in French).
[9] T. Baki. Survey on the nucleate pool boiling of hydrogen and its limits. Journal of Mechanical and Energy Engineering, 4(2):157–166, 2020. doi: 10.30464/jmee.2020.4.2.157.
[10] S. Deb, S. Pal, D.Ch. Das, M. Das, A.K. Das, and R. Das. Surface wettability change on TF nanocoated surfaces during pool boiling heat transfer of refrigerant R-141b. Heat and Mass Transfer, 56(12):3273–3287, 2020. doi: 10.1007/s00231-020-02922-w.
[11] O. Khliyeva, V. Zhelezny, T. Lukianova, N. Lukianov, Yu. Semenyuk, A.L.N. Moreira, S.M.S. Murshed, E. Palomo del Barrio, and A. Nikulin. A new approach for predicting the pool boiling heat transfer coefficient of refrigerant R141b and its mixtures with surfactant and nanoparticles using experimental data. Journal of Thermal Analysis and Calorimetry, 142(6):2327–2339, 2020. doi: 10.1007/s10973-020-09479-0.
[12] M.Y. Abdullah, Prabowo, and B. Sudarmanta. Analysis degrees superheating refrigerant R141b on evaporator. Heat and Mass Transfer, 1–13, 2020. doi: 10.1007/s00231-020-02963-1.
[13] T. Li, X. Wu, and Q. Ma. Pool boiling heat transfer of R141b on surfaces covered copper foam with circular-shaped channels. Experimental Thermal and Fluid Science, 105:136–143, 2019. doi: 10.1016/j.expthermflusci.2019.03.015.
[14] W.M. Rohsenow. A method of correlating heat transfer data for surface boiling of liquids. Technical Report No. 5.MIT, USA, 1952.
[15] D.A. Labuntsov. Heat transfer problems with nucleate boiling of liquids. Thermal Engineering, 19(9):21–28, 1973.
[16] M.G. Cooper. Saturation nucleate pool boiling – a simple correlation. In: H.C. Simpson et al. (eds.), First U.K. National Conference on Heat Transfer, The Institution of Chemical Engineers Symposium Series, Volume 2.86, pages 785–793, Pergamon, 1984. doi: 10.1016/B978-0-85295-175-0.50013-8.
[17] K. Cornwall and J.G. Einarsson. Peripheral variation of heat transfer under pool boiling on tubes. International Journal of Heat and Fluid Flow, 4(3):141–144, 1983. doi: 10.1016/0142-727X(83)90059-0.
[18] P.R. Dominiczak and J.T. Cieśliński. Circumferential temperature distribution during nucleate pool boiling outside smooth and modified horizontal tubes. Experimental Thermal and Fluid Science, 33(1):173–177, 2008. doi: 10.1016/j.expthermflusci.2008.07.007.
[19] K. Fukuda and A. Sakurai. Effects of diameters and surface conditions of horizontal test cylinders on subcooled pool boiling CHFs with two mechanisms depending on subcooling and pressure. In: 12th International Heat Transfer Conference, Grenoble, France, August 18–23, 2002. doi: 10.1615/IHTC12.4530.
[20] S.G. Kandlikar. Critical heat flux in subcooled flow boiling – An assessment of current understanding and future directions for research. Multiphase Science and Technology, 13(3):207–232, 2001. doi: 10.1615/MultScienTechn.v13.i3-4.40.
[21] S.S. Kutateladze. On the transition to film boiling under natural convection. Kotloturbostroenie, 3:152–158, 1948.
[22] W.M. Rohsenow, J.P. Hartnett, and Y.I. Cho (eds). Handbook of Heat Transfer, 3 edition, Mc Graw-Hill, 1998.
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Authors and Affiliations

Touhami Baki
1
ORCID: ORCID
Abdelkader Aris
2
Mohamed Tebbal
1

  1. Faculty of Mechanics, Gaseous Fuels and Environment Laboratory, University of Sciences andTechnology of Oran Mohamed Boudiaf (USTO-MB), El Mnaouer, Oran, Algeria.
  2. ENP. Oran, Laboratoire de Recherche en Technologie de Fabrication Mécanique, Algeria
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Abstract

In the paper the experimental analysis of dryout in small diameter channels is presented. The investigations were carried out in vertical pipes of internal diameter equal to 1.15 mm and 2.3 mm. Low-boiling point fluids such as SES36 and R123 were examined. The modern experimental techniques were applied to record liquid film dryout on the wall, among the others the infrared camera. On the basis of experimental data an empirical correlation for predictions of critical heat flux was proposed. It shows a good agreement with experimental data within the error band of 30%. Additionally, a unique approach to liquid film dryout modeling in annular flow was presented. It led to the development of the three-equation model based on consideration of liquid mass balance in the film, a two-phase mixture in the core and gas. The results of experimental validation of the model exhibit improvement in comparison to other models from literature.

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Authors and Affiliations

Jan Wajs
Dariusz Mikielewicz
Michał Gliński
ORCID: ORCID

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