Development of a criterion equation for heat transfer calculation inside a gaseous fuel supply channel of gas burner with a heat transfer intensifier

Аuthors

Altunin K. V.^*, Badanov N. S.

Kazan National Research Technical University named after A.N. Tupolev, Kazan, Russia

*e-mail: altkonst881@yandex.ru

Abstract

The paper is devoted to generalization of experiments results with a domestic stove gas burner. A new literature analysis was successfully conducted and let to highlight the main scientists, engineers who paid a great attention to development of new energy-efficient gas burners. All experiments were carried out with a simple gas burner of the domestic stove of Gefest 1200 – C6 type. During the experimental study there were two main schemes of gas burners that were used, first, the gas burner without any possible heat transfer intensifiers such as a majority of modern gas burners across the world, and second, the gas burner that had a special metal rod attached to the metal lid, and it had the thread on its surface too. Thus, the thread was the main heat transfer intensifier. The experimental study also included an application of the same metal rod but with an additional heat transfer intensifier such as two longitudinal spacing gaps. The gaseous fuel supply channel was in a form of diffusor. It was proved that the following increase of heat conduction coefficient let to increase a heat transfer coefficient and, simultaneously, increase of efficiency of the gas burner as well. The maximum heat transfer coefficient was obtained on the level of h = 989 W/(m2K) with the application of long copper rod with its thread and without any longitudinal spacing gaps. The successful generalization of all the data was done and the new heat transfer equation was obtained that included dimensionless numbers such as Nusselt and Reynolds criterions. This equation lets to calculate the heat transfer coefficient inside a gaseous fuel supply channel of gas burner with a heat transfer intensifier. It was noticed that presence or absence of longitudinal spacing gaps in the metal rod did not make influence on the empirical coefficient c in the obtained heat transfer criterion equation if the calculation was built on thermophysical properties of natural gas and air mixture. Additionally, new graphs such as heat transfer coefficient vs. Reynolds number graphs were created for special cases of heat properties calculation based on natural gas data and based on gas-air mixture data. 

Keywords:

gas burner, heat transfer intensifier, natural gas, gas stove, number, equation

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