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Title: Effect of translucence of engineering ceramics on heat transfer in diesel engines

Abstract

This report describes the experimental portion of a broader study undertaken to assess the effects of translucence of ceramic materials used as thermal barrier coatings in diesel engines. In an earlier analytical work a parametric study was performed, varying several radiative properties over ranges typical of engineering ceramics, thereby identifying the most important radiative properties and their impact on in-cylinder heat transfer. In the current study these properties were experimentally determined for several specific zirconia coatings considered for thermal barrier applications in diesel engines. The methodology of this study involved formulation of a model capable of describing radiative transfer through a semitransparent medium as a function of three independent model parameters, ie, absorption coefficient, scattering coefficient and refractive index. For the zirconia-based ceramics investigated in this study, it was concluded that for usual coating thicknesses (1.5--2.5 mm) these ceramics are optically thick and hence, are effective as radiative heat transfer barriers. These ceramics possess high scattering coefficients and low absorption coefficients causing them to be highly reflective (60-80%) in the spectral region where thermal radiation is important. The performance of the investigated ceramics and the mechanism of heat transfer were found to depend on surface condition, specifically on soot deposition.more » Thus, to insure the optimum thermal barrier operation for either clean or heavily sooted surfaces, a ceramic material with high scattering coefficient provides the best choice.« less

Authors:
;  [1]
  1. Integral Technologies, Inc., Westmont, IL (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab., TN (United States); Integral Technologies, Inc., Westmont, IL (United States)
Sponsoring Org.:
USDOE; USDOE, Washington, DC (United States)
OSTI Identifier:
7267573
Report Number(s):
ORNL/Sub-88-22042/2
ON: DE92041384
DOE Contract Number:  
AC05-84OR21400
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; 36 MATERIALS SCIENCE; DIESEL ENGINES; MATERIALS; ZIRCONIUM OXIDES; HEAT TRANSFER; CERAMICS; COATINGS; ENERGY ABSORPTION; PROGRESS REPORT; REFRACTION; SCATTERING; ABSORPTION; CHALCOGENIDES; DOCUMENT TYPES; ENERGY TRANSFER; ENGINES; HEAT ENGINES; INTERNAL COMBUSTION ENGINES; OXIDES; OXYGEN COMPOUNDS; SORPTION; TRANSITION ELEMENT COMPOUNDS; ZIRCONIUM COMPOUNDS; 330102* - Internal Combustion Engines- Diesel; 360204 - Ceramics, Cermets, & Refractories- Physical Properties

Citation Formats

Wahiduzzaman, S, and Morel, T. Effect of translucence of engineering ceramics on heat transfer in diesel engines. United States: N. p., 1992. Web. doi:10.2172/7267573.
Wahiduzzaman, S, & Morel, T. Effect of translucence of engineering ceramics on heat transfer in diesel engines. United States. https://doi.org/10.2172/7267573
Wahiduzzaman, S, and Morel, T. Wed . "Effect of translucence of engineering ceramics on heat transfer in diesel engines". United States. https://doi.org/10.2172/7267573. https://www.osti.gov/servlets/purl/7267573.
@article{osti_7267573,
title = {Effect of translucence of engineering ceramics on heat transfer in diesel engines},
author = {Wahiduzzaman, S and Morel, T},
abstractNote = {This report describes the experimental portion of a broader study undertaken to assess the effects of translucence of ceramic materials used as thermal barrier coatings in diesel engines. In an earlier analytical work a parametric study was performed, varying several radiative properties over ranges typical of engineering ceramics, thereby identifying the most important radiative properties and their impact on in-cylinder heat transfer. In the current study these properties were experimentally determined for several specific zirconia coatings considered for thermal barrier applications in diesel engines. The methodology of this study involved formulation of a model capable of describing radiative transfer through a semitransparent medium as a function of three independent model parameters, ie, absorption coefficient, scattering coefficient and refractive index. For the zirconia-based ceramics investigated in this study, it was concluded that for usual coating thicknesses (1.5--2.5 mm) these ceramics are optically thick and hence, are effective as radiative heat transfer barriers. These ceramics possess high scattering coefficients and low absorption coefficients causing them to be highly reflective (60-80%) in the spectral region where thermal radiation is important. The performance of the investigated ceramics and the mechanism of heat transfer were found to depend on surface condition, specifically on soot deposition. Thus, to insure the optimum thermal barrier operation for either clean or heavily sooted surfaces, a ceramic material with high scattering coefficient provides the best choice.},
doi = {10.2172/7267573},
url = {https://www.osti.gov/biblio/7267573}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {4}
}