Heat and mass exchange for thermo-destruction of hydrocarbon fuels within pipe channels

Аuthors

Myakochin A. S.

Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia

e-mail: amyakochin@gmail.com

Abstract

An experimental study is carried out to analyze heat and mass exchange for thermo-destruction process in regard to hydrocarbon fuels in conditions of pumping through heated pipe channel. The processes are studied for such condition range as pressures from 0.1 MPa to 8.0 MPa, intake fuel temperature 400—500°C, outlet pyrogas temperature 550—750°C, and for Reynolds numbers range from 2· 10³ to 1.4· 10⁴.

Pressure increasing as well as residence time (τ from 0.005 s to 0.2 s) for fuel within the channel leads to rising gasification magnitude and calorific effect for thermo-destruction reactions of hydrocarbon fuels. A temperature of gasification beginning decreases for such conditions. For a large heat loadings case is revealed a sharp decrease of heat transfer caused by flow laminarization effect. The fuel thermo-destruction inhibits temperature rising for channel walls accompanied with heat transfer decreasing if the reaction runs in the kinetic mode. The heat transfer decreasing becomes as a «thermal explosion» if the reaction runs in a diffusion region. Bounds of decreasing heat transfer region are obtained for thermo-destruction of hydrocarbon fuels as well as experimental data are generalized basing on local heat transfer data using Damkeller number.