An experimental study of the influence of a thermosyphon filling ratio on a temperature distribution in characteristic points along the vapor channel height

Abstract

Abstract.Results of experimental studies of heat transfer in a thermosyphon illustrating the influence of the filling ratio and the heat load on the temperature distribution in the vapor channel, evaporation and condensation zones are presented. The thermosyphon was made of copper and was 161 mm high with side walls 1.5 mm thick, bottom cover 2 mm thick, an internal dimmer of the evaporation part of 54 mm and an internal diameter of the vapor channel of 39.2 mm. Based on the results of experimental studies, temperature dependences were established in the characteristic cross sections of the thermosyphon on the heat flux value supplied to the bottom cover. In addition, a well-appearing thermosyphon self-regulation property has been found -the growth of the heat load in the evaporation zone in the range from 1940 to 7685 W/m 2 does not lead to a decrease in the heat removal intensity from the heat-release region.

Potential of composite fuel application based on low-grade coal and wastes of forest and flour industry

“…When this type of fuel is burned, significant emissions of polluting anthropogenic substances occur, such as oxides of sulfur, carbon, nitrogen, fly ash and other [5,6]. Modern methods of harmful emission reducing are effective but with improper and inadequate maintenance, the efficiency of the filters used is lowered by more than 50% [7]. It leads to significant increasing of heat and power generation costs [7].…”

“…Modern methods of harmful emission reducing are effective but with improper and inadequate maintenance, the efficiency of the filters used is lowered by more than 50% [7]. It leads to significant increasing of heat and power generation costs [7].…”

“…Possible solution for this problem may be a less expensive and more environmentally friendly composite fuel based on coal and sawmill waste (fine pine wood) [7]. The effectiveness of such fuels is achieved due to the carbon-neutrality of wood.…”

“…It is the most common substance on the planet and its processing creates waste at colossal volumes. There is a problem of storage and subsequent transportation of such composite fuels [7]. The production of fuel briquettes is often carried out by thermal method with the addition of binders.…”

Influence of Cu(NO3)2 initiation additive in two-stage mode conditions of coal pyrolytic decomposition

“…The main effect appearing during application of such promoters is reducing of initial temperature of volatile matter release as well as shifting fuel oxidation into lowtemperature area [2][3][4] which has a favorable effect on the efficiency of the energy equipment [5][6][7][8]. Scientific studies reported that activation of metal-based catalytic additives during fuel oxidation appears to be most effective only at high temperatures (above 500 °C) [9][10][11]. In our previous studies [12] it was found that additives of metal oxide precursors in form of mineral salts are able to provide sufficient initiative impact on coal oxidation process.…”