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The turbulent flow in a square-sectioned duct with an installed bend was investigated numerically. The calculations were based on two different turbulence models, namely the standard k-epsilon model and the k-omega SST model. The numerical computations were carried out using the commercial software package FLUENT 6.1. Numerical results for velocity, turbulent intensity and pressure distributions are...
A theoretical and experimental analysis of propagation of disturbances and determination of propagation velocity in a two-phase refrigeration medium has been made. During investigations on the experimental facility, a step change of the pressure in flow of a refrigerant R404A was induced. The introduced disturbance propagated with a finite velocity depending on the parameters of the medium and, more...
This paper presents the results of experiential investigations of pressure drop in minichannels with use of water as the working fluid. The test section was made from stainless steel pipes with internal diameters of 0.55 mm, 0.64 mm and 1.10 mm respectively. A pressure drop was presented per a length unit as the function of Reynolds number both for laminar and turbulent flow. A comparison of the experimental...
In the paper a new LiBr-H20 sorption system for the whole year use in medium European conditions has been presented. Thermodynamics of the system has been simulated for the steady state conditions, using realistic efficiency factors for each exchanger. The simulation has been done for each characteristic period of the year. Also the heat exchangers surfaces have been estimated using cautiously selected...
In this work there are presented flow calculation models through the longitudinal eccentric throttle clearance ring. There are shown some calculations for laminar and turbulent flow. Turbulent flow is described as self-similar and with application of model k -epsilon, the description is illustrated with calculative example. The measurement results of pressure fields measured in the longitudinal eccentric...
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