Wall heat recirculation and exergy preservation in flow through a small tube with thin heat source

Som, S. K.; Rana, U. S.

doi:10.1016/j.icheatmasstransfer.2015.03.001

Cited by 7 publications

(1 citation statement)

References 15 publications

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“…Heat recirculation and external heating are common and effective methods to reduce heat losses. Heat recirculation which means that enthalpy from burned gas was recirculated to preheat reactants, was widely used in research jobs [5,6]. External heating of combustor can prevent flame from quenching in an internal diameter smaller than quenching diameter [7,8,9].…”

Section: Introductionmentioning

confidence: 99%

Thermal performance of a meso-scale combustor with electrospray technique using liquid ethanol as fuel

Gan

Chen

Tong

et al. 2018

Applied Thermal Engineering

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A new meso-scale combustor to be coupled with energy conversion modules was fabricated. The volume of the combustor was on the order of a few cubic centimeters. Ethanol was applied as fuel and electrosprayed at the flow rate of 3.5ml/h. Stable flame which shaped in a rounded slice was achieved near the mesh as equivalence ratios varying from 0.9~1.7 without external heating and catalyst. The temperatures of flame, combustor outer wall and exhausted gas were measured. Flame temperatures were within the range of 1100 K to 1300 K. Exhausted gas components were detected by a gas chromatograph and the combustion efficiencies were estimated in the range of 51.18% to 92.43%. Heat losses from the combustor wall were calculated and accounted for about 35% of input energy. The combustion efficiency and flame temperature reached their maximum values of 92.43 % and 1287.26 K respectively at equivalence ratio = 1.0. The outer wall temperature distributions along the flow direction were measured and heat recirculation zone was found about 10mm in the upstream of the mesh, which was beneficial for stable combustion. The steel mesh not only helped to gather charged droplets as a collector but also act as a flame holder. Thermal efficiency exceeded 21.0% and maximal thermal efficiency was up to 48.8%.

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