Abstract
This issue of using certain part of the kinetic energy of the flow for imparting vibration for special local turbulators (LT), consisting of an elastic thread with strung on it through a certain distance volume elements (made of a special material) of various geometric configuration installed in the tubes of the heat exchanger with fixing one end of the thread at the inlet, and the other end remains free. The results of numerical and experimental studies are presented, which show the effectiveness of the use of LT for intensifying the processes of hydrodynamics and heat transfer.
Highlights
Analysis of known sources on the topic under study allows us to note many effective methods for intensifying heat transfer, such as: artificial turbulization of the flow in the near-wall zone using various methods
The vibration of the heat exchange surface intensifies the heat transfer, along with this, the heat exchanger itself is subjected to vibration and its reliability necessary to take into account the efficiency, and the manufacturability and contamination of the surface. of operation decreases
When choosing a method for intensifying heat transfer, it is Physical model and hydrodynamic principles local turbulators (LT) consists of an elastic wire 1 and hollow elements 2 strung on it at a certain distance (Fig. 1.)
Summary
Analysis of known sources on the topic under study allows us to note many effective methods for intensifying heat transfer, such as: artificial turbulization of the flow in the near-wall zone using various methods Computer modeling and numerical analysis A numerical study of the turbulization of coolant flows with the help of LT in the tubes of the heat exchanger was carried out, where the parameters of the operating experimental setup were taken as the initial data for the calculation: internal diameter of the tube - 20 mm; tube length 400–1100 mm; coolant speed 0.01–0.15 m / s. Analysis of the results of numerical experiments showed that some LT designs strongly change the distribution pattern value of speed, head loss and temperature in the tube. This influence is especially evident in the near-night zone. Influence of fluid flow turbulization on the processes of hydrodynamics and heat transfer Figures 5, 6 and 7 show graphical dependencies obtained by the method of a numerical experiment and data from a physical experiment. The shift of the jumps to Figure: 8. Schematic diagram of the experimental setup: 1- glass tube; 2- valve for regulating water flow; 3- metal tube with LT; 4- thermal insulation with an internal heat source; 5- supply of electrical energy to 4; 6- metal tube without LT; 7- water pump; 8 and 9 - electrically heated thermostat; 10- water flow meter: 11- connecting pipelines; 12- manometers; БЩУ - Control Panel Unit
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