Resistance coefficient during ice slurry flow through pipe sudden constriction

• Autorzy: Mika, Ł.
• Języki publikacji: EN

Abstrakty

EN

Due to the adverse environmental effects of some commonly-used refrigerants, efforts are still underway to find new cooling mediums that would be safer to the ozone layer and would not increase the greenhouse effect. Ice slurry as a new ecological coolant suits the processes requiring the preservation of constant and equal temperature in the cooling process of the full section of the cooled solid. Thanks to that, ice slurry can find a wide potential application in such branches of industry, as heat treatment, materials engineering, or foundry. In this paper, flow systems which are commonly used in fittings elements such as diameter’s reductions in ice slurry pipelines, are experimentally investigated. In the study reported in this paper, the consideration was given to the specific features of the slurry flow in which the flow qualities depend mainly on the volume fraction of solid particles. The results of the experimental studies on the flow resistance, presented herein, enabled to determine the resistance coefficient during the ice slurry flow through the pipe sudden constriction. The volume fraction of solid particles in the slurry ranged from 5 to 30%. The recommended and non-recommended range of the Reynolds number for the ice slurry flow through the pipe sudden constriction were presented in this paper. The experimental studies were conducted on a few variants of the most common reductions of copper pipes. Further studies on the determination of the resistance coefficient in the remaining fittings elements of the pipeline were recommended in the paper as well as the further theoretical studies intended to determine the theoretical relations to calculate the resistance coefficient in all the fittings elements in the pipeline (on the basis of the experimental studies) and to elaborate the calculation pattern of the entire ice slurry system.

Słowa kluczowe

PL

szlam lodowy; stosowanie szlamu; badania odporności; współczynnik oporu; ochrona środowiska

EN

ice slurry; application ice slurry; studies of resistance; resistance coefficient; environment protection

• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2010
• Tom: Vol. 10, iss. 3 spec.
• Strony: 201--204
• Opis fizyczny: Bibliogr. 8 poz., wykr.

Twórcy

autor

Mika, Ł.

• Politechnika Krakowska, Zakład Chłodnictwa i Klimatyzacji, al. Jana Pawła II 37, 31-864 Kraków,

Bibliografia

• [1] B. D. Knodel, D.M. France, Pressure drop in ice-water slurries for thermal storage application, Experimental Heat Transfer 1 (1988).
• [2] L. Mika: Experimental investigations on flow resistance of slurry ice – pressure drop in pipe reductions, Chemical Engineering nr 6 (2009) (in Polish).
• [3] B. Niezgoda, W. Zalewski, Momentum transfer of ice slurries flows in tubes. Modeling, International Journal of Refrigeration 2, 2006.
• [4] R. M Turian, T.W. Ma, F.L. Hsu, D.J. Sung, G.W. Plackmann, Flow of concentrated non-newtonian slurries: Friction losses in bends, fittings, Valves and Venturie meters, International Journal Multiphase Flow, Vol. 24, nr 2 (1998).
• [5] B. Niezgoda-Żelasko: Het transfer and pressure drop of ice slurries flows in tubes, Publication Cracow University of Technology 2006 (in Polish).
• [6] C. Grabarczyk: Liquid flow in pipes. Computational Methods. Envirotech, Poznań 1997 (in Polish).
• [7] W. Wedrychowicz, K. Jezowiecka-Kabsh, A. Grigoriev, K. Strzelecka: Dependence of the resistant coefficient on the Reynolds number during the flow of water through pipe sudden constriction Environment Protection. nr 3 (2006) (in Polish).
• [8] L. Mika: Research of resistance coefficient during slurry ice flow through pipe sudden constriction Chemical Engineering nr 1 (2010) (in Polish).