DropletEvapBurn1Lect25ME525SP2011

# DropletEvapBurn1Lect25ME525SP2011 - ME 525 Combustion...

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School of Mechanical Engineering, Purdue University ME 525: Combustion Lecture 25: Droplet Evaporation and Burning 1 Prof. Robert P. Lucht Room 87, Mechanical Engineering Building School of Mechanical Engineering Purdue University West Lafayette, Indiana [email protected] , 765-494-5623 (Phone) April 12, 2011

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School of Mechanical Engineering, Purdue University Lecture Topics • Model for droplet evaporation. • Definition of the Spalding number. • Droplet lifetimes. • Liquid fuels widely used in combustion, droplet evaporation and combustion very important especially in gas turbine engines, diesel engines, and rockets combustion chambers where evaporation and combustion occur simultaneously.
School of Mechanical Engineering, Purdue University Evaporating Droplet r s T d = T s = T boil T r T boil

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School of Mechanical Engineering, Purdue University Model for the Evaporating Droplet Assume that Droplet evaporates in quiescent, infinite medium Evaporation process is quasi-steady (droplet radius changes slowly in time) Fuel is single-component, no dissolved gases Droplet temperature is uniform: T d = T boil T > T boil Le = 1 k g , c Pg , and g are constants evaluated at some mean temperature
School of Mechanical Engineering, Purdue University Model for the Evaporating Droplet: Conservation Equations Gas Phase Conservation Equations: r > r s Mass Energy: for constant specific heat, spherical coordinates   2 v4 Fr m r m r const     2 2 1 v0 P rP dc d T d rc d T rd r d r     D 2 2 1 grp g g gp g dd T r c T const c r

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## This note was uploaded on 12/27/2011 for the course ME 525 taught by Professor Lucth during the Fall '11 term at Purdue.

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DropletEvapBurn1Lect25ME525SP2011 - ME 525 Combustion...

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