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Experimental investigations of hydraulic jump created by a two-phase impinging jet an a solid surface

100%

Gumkowski S.

tom nr 112

119-124

In the paper the results of experimental investigations concerning the hydraulic jump formed by an aerosol impinging jet have been presented. Results of carried out experiments yield that aerosol impinging jet enables to form significantly higher diameter of the hydraulic jump, as compared with single phase, liquid impinging jet. This is caused by shear stresses, between liquid layer, formed by liquid deposited from aerosol, and gas, which is the second component of aerosol.

Theoretical analysis of heat transfer between a liquid layer formed by an impinging gas liquid jet and a solid surface

100%

Gumkowski S.

2007

tom Vol. 28, z. 2

347-355

Heat transfer phenomenon between a horizontal solid surface and a liquid layer created on a surface by an axisymmetrical liquid gas impinging jet has been analysed. The analytical treatment of the phenomenon is devoted to the area whose diameter is lower than the diameter of the hydraulic jump.

Przedstawiono opis matematyczny zjawiska wymiany ciepła między poziomą stałą powierzchnią a przepływającą po niej warstwą cieczy powstałej z napływającej na powierzchnię osiowo-symetrycznej strugi gazowo-cieczowej. Analiza dotyczy obszaru o średnicy mniejszej od średnicy powstania uskoku hydraulicznego.

Distribution of heat generated by a local heat source

63%

Gumkowski S. , Gościk J.

2005

tom Vol. 26, no. 4

69-86

In the paper, results of analytical investigations concerning distribution of heat generated by local heat source placed in a solid plate, have been presented. The analysis yields the conclusion that in the considered case, the distribution of heat depends mainly on the heat transfer coefficient between the surface and liquid layer flowing at that surface. As a result the qualitative formula was obtained, which can be helpful for accurate determination of heat transfer coefficient without commonly applied assumption about negligible conductive heat losses in the plate.

Analysis of a possible application of a small power plant in the Organic Rankine Cycle, which apply waste heat from a combustion engine

63%

Żabski J. , Gumkowski S.

2018

tom T. 1

127--135

Some considerations on the waste heat treatment, heat and power combined generation and principles of the Organic Rankine Cycle and its application are produced. A thermodynamic screening of eight working fluids for Organic Rankine Cycle (ORC) was carried out. All investigated agents were single component fluids. The considered ORC systems operated at the upper temperature in the range Tmax=146-185°C and the lower one Tmin=27-37°C. The highest pressure in the cycles equalled pmax=3500 kPa and pmin=85 kPa. The cycles were run at subcritical pressures and the saturated vapour line was of the overhanging type in all cases. Heat regeneration was not considered in this paper. The heat source for the ORC system was heated air exhausted from the cooling system of an opposed-piston engine. The temperature of this heat at the inlet to ORC was equal to Th,in=230°C. Air was also the heat sink for the ORC with the inlet temperature Tcold,in=20°C. The power output of the ORC, neglecting electric generator efficiency, was kept in the range N=10-11 kW. Calculated thermal efficiencies h held values between 0.121 and 0.164.