Abstract
The progress in the development of methods for calculating heat transfer in torch furnaces, fireboxes, and combustion chambers is analyzed. In the XIX-XX centuries calculations of radiative heat exchange were followed the methods based on the laws of radiation from black body, disclosed in the XVII-XX. It is substantiated that there is crisis of methods for calculating heat transfer in torch furnaces, fire boxes and combustion chambers. In the early XXI century the author of this manuscript disclosed the laws of radiation from torch gas volumes, described in the article.
Highlights
Radiant heat transfer is the main kind of heat transfer and accounts for 90–98% of the total heat transfer in steam boiler fireboxes (Blokh, Juravlev, & Ryzkov, 1991), torch heating and melting furnaces (Telegina, 1993; Krivandin & Egorov, 1989; Makarov & Svenchanskii, 1992).Since the late 19th century and throughout the 20th century, heat transfer in torch furnaces, fireboxes, and combustion chambers was calculated based on the law of radiation from black body, on the law, that was experimentally established by Y
It must be admitted that path of heat transfer research in furnaces, fire boxes, combustion chambers chosen in 1910-20 investigation and being improved throughout the 20th century has proven to be stalemate
"In modeling a flame and an arc by isothermal coaxial cylindrical gas layers and calculating radiative heat transfer, the results of calculations include the volume radiation and absorption in all flame layers and the transfer of heat between them and all heating surfaces.". It follows from five laws of heat radiation, that radiation from isothermal coaxial cylindrical gas volumes is invariant, i.e., the parameters of their radiation, properties are equal to each other.the radiation from any large gas volume of a high power may be equivalently replaced by radiation from coaxial cylinder gas volumes of a small diameter equal in power .The laws for heat transfer from gas volumes spare us from triple, quadruple integration in radiative heat transfer calculating and make it possible to estimate parameters for radiation from cylinder gas volumes by single integrating of geometric and trigonometric dependences of coaxial cylinder volume of small diameter or, as it is often determined, linear radiation source
Summary
Radiant heat transfer is the main kind of heat transfer and accounts for 90–98% of the total heat transfer in steam boiler fireboxes (Blokh, Juravlev, & Ryzkov, 1991), torch heating and melting furnaces (Telegina, 1993; Krivandin & Egorov, 1989; Makarov & Svenchanskii, 1992). Since the late 19th century and throughout the 20th century, heat transfer in torch furnaces, fireboxes, and combustion chambers was calculated based on the law of radiation from black body, on the law, that was experimentally established by Y. Stefan in 1879 in studying radiation from solid bodies, which was theoretically substantiated by L. Boltzmann in 1884 in studying radiation from solid bodies analytically. In the late 19th – early20th century, solid lumped fuel (coal, blacks, peat, wood) was fired in furnaces on fire grates, and the first descriptions of heat transfer processes were essentially descriptions of calculation problems of radiant heat transfer between two arbitrarily located hard surfaces (a fuel bed and a heating surface) on the basis of Stefan– Boltzmann’s law
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