• New models of evaporating liquid films in heated tubes are developed. Liquid particles allowed to overtake one another. Non-uniform evaporation proposed. Models derived from the physical conservation laws. described by time-delay equations relating inflow and outflow. The paper presents novel control-oriented transport for a falling film evaporator. In this context, our goal consists qualitat...

This paper deals with the investigation of substitutes for R-22 and their heat transfer behaviour in a plate-type evaporator with a falling water film as heat source. Alternatives investigated were R-134a and two new refrigerant mixtures. Measurements on a 3m x 0,5m plate showed a superior performance ofR-134a compared to R-22 and mixtures at equal test conditions and a distinct difference betw...

The modelling of the parameters that influence the continuous evaporation of an alcoholic extract was considered using Doehlert matrices. The work was performed with a wiped falling film evaporator that allowed us to study the influence of the pressure, temperature, feed flow and dry matter of the feed solution on the dry matter contents of the resulting concentrate, and the productivity of the...

The purpose of this work is investigation changes in hydrodynamic parameters (absolute pressure, mass flow rates solution and secondary steam, steam velocity, irrigation density, pressure loss) along the length heat exchange tube a vertical falling film evaporator. obtained data distribution were used design evaporators.

The purpose of this work is investigation the distribution gas phase velocity and liquid irrigation density at outlet heat exchange tube a vertical falling film evaporator. Experimental studies hydrodynamics two-phase flow were carried out on pilot instalation. Radial distributions various distances from lower section heating are obtained. It established that high velocities contribute to turbu...