Abstract
The values of absorption coefficients of gasoline fuel (BP Pump Grade 95 RON ULG (research octane number unleaded gasoline)), 2,2,4-trimethylpentane (CH3)2CHCH2C (CH3)3 (iso-octane) and 3-pentanone CH3CH2COCH2CH3 have been measured experimentally in the range of wavelengths between 0.2 μm and 4 μm. The values of the indices of absorption, calculated based on these coefficients, have been compared with those previously obtained for low sulphur ESSO AF1313 diesel fuel. These values are generally lower for pure substances (e.g., iso-octane and 3-pentanone) than for diesel and gasoline fuels. The values of the average absorption efficiency factor for all fuels are approximated by a power function aRdb, where Rd is the droplet radius. a and b in turn are approximated by piecewise quadratic functions of the radiation temperature, with the coefficients calculated separately in the ranges of droplet radii 2-5 μm, 5-50 μm, 50-100 μm, and 100-200 μm for all fuels. This new approximation is shown to be more accurate compared with the case when a and b are approximated by quadratic functions or fourth power polynomials of the radiation temperature, with the coefficients calculated in the whole range 2-200 μm. This difference in the approximations of a and b, however, is shown to have little effect on modeling of fuel droplet heating and evaporation in conditions typical for internal combustion engines, especially in the case of diesel fuel and 3-pentanone.
| Original language | English |
|---|---|
| Pages (from-to) | 1246-1255 |
| Number of pages | 10 |
| Journal | Journal of Heat Transfer |
| Volume | 129 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - Sep 2007 |
| Externally published | Yes |
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Keywords
- Absorption efficiency factor
- Evaporation
- Fuel droplets
- Heating
- Thermal radiation
ASJC Scopus subject areas
- Mechanical Engineering
- Physical and Theoretical Chemistry
- Fluid Flow and Transfer Processes
Cite this
Approximate analysis of thermal radiation absorption in fuel droplets. / Sazhin, S. S.; Kristyadi, T.; Abdelghaffar, W. A.; Begg, S.; Heikal, M. R.; Mikhalovsky, S. V.; Meikle, S. T.; Al-Hanbali, O.
In: Journal of Heat Transfer, Vol. 129, No. 9, 09.2007, p. 1246-1255.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Approximate analysis of thermal radiation absorption in fuel droplets
AU - Sazhin, S. S.
AU - Kristyadi, T.
AU - Abdelghaffar, W. A.
AU - Begg, S.
AU - Heikal, M. R.
AU - Mikhalovsky, S. V.
AU - Meikle, S. T.
AU - Al-Hanbali, O.
PY - 2007/9
Y1 - 2007/9
N2 - The values of absorption coefficients of gasoline fuel (BP Pump Grade 95 RON ULG (research octane number unleaded gasoline)), 2,2,4-trimethylpentane (CH3)2CHCH2C (CH3)3 (iso-octane) and 3-pentanone CH3CH2COCH2CH3 have been measured experimentally in the range of wavelengths between 0.2 μm and 4 μm. The values of the indices of absorption, calculated based on these coefficients, have been compared with those previously obtained for low sulphur ESSO AF1313 diesel fuel. These values are generally lower for pure substances (e.g., iso-octane and 3-pentanone) than for diesel and gasoline fuels. The values of the average absorption efficiency factor for all fuels are approximated by a power function aRdb, where Rd is the droplet radius. a and b in turn are approximated by piecewise quadratic functions of the radiation temperature, with the coefficients calculated separately in the ranges of droplet radii 2-5 μm, 5-50 μm, 50-100 μm, and 100-200 μm for all fuels. This new approximation is shown to be more accurate compared with the case when a and b are approximated by quadratic functions or fourth power polynomials of the radiation temperature, with the coefficients calculated in the whole range 2-200 μm. This difference in the approximations of a and b, however, is shown to have little effect on modeling of fuel droplet heating and evaporation in conditions typical for internal combustion engines, especially in the case of diesel fuel and 3-pentanone.
AB - The values of absorption coefficients of gasoline fuel (BP Pump Grade 95 RON ULG (research octane number unleaded gasoline)), 2,2,4-trimethylpentane (CH3)2CHCH2C (CH3)3 (iso-octane) and 3-pentanone CH3CH2COCH2CH3 have been measured experimentally in the range of wavelengths between 0.2 μm and 4 μm. The values of the indices of absorption, calculated based on these coefficients, have been compared with those previously obtained for low sulphur ESSO AF1313 diesel fuel. These values are generally lower for pure substances (e.g., iso-octane and 3-pentanone) than for diesel and gasoline fuels. The values of the average absorption efficiency factor for all fuels are approximated by a power function aRdb, where Rd is the droplet radius. a and b in turn are approximated by piecewise quadratic functions of the radiation temperature, with the coefficients calculated separately in the ranges of droplet radii 2-5 μm, 5-50 μm, 50-100 μm, and 100-200 μm for all fuels. This new approximation is shown to be more accurate compared with the case when a and b are approximated by quadratic functions or fourth power polynomials of the radiation temperature, with the coefficients calculated in the whole range 2-200 μm. This difference in the approximations of a and b, however, is shown to have little effect on modeling of fuel droplet heating and evaporation in conditions typical for internal combustion engines, especially in the case of diesel fuel and 3-pentanone.
KW - Absorption efficiency factor
KW - Evaporation
KW - Fuel droplets
KW - Heating
KW - Thermal radiation
UR - http://www.scopus.com/inward/record.url?scp=35348947058&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=35348947058&partnerID=8YFLogxK
U2 - 10.1115/1.2740304
DO - 10.1115/1.2740304
M3 - Article
VL - 129
SP - 1246
EP - 1255
JO - Journal of Heat Transfer
JF - Journal of Heat Transfer
SN - 0022-1481
IS - 9
ER -