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Neutron Radiography Study of Diesel Engine Exhaust Soot Depositions in a Exhaust Pipe With and Without Water Coolant
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 20, 2009 by SAE International in United States
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An investigation was performed to study the soot deposition and its effect on heat transfer in a cooled cylindrical section. The soot layer thickness was measured using a non-destructive neutron radiography technique. Experiments were performed for a diesel exhaust mass flow rate of 20kg/hr or Reynolds number of approximately 9,000, initial inlet coolant temperatures of approximately 22 and 40°C, and exposure times from 1 to 3 hours. The results show that the nominal soot layer thickness was approximately uniform in the flow direction, hence, the thicker soot layer observed near the entrance by Ismail et al.  and de la Cruz et al.  was due to entrance effects. The deposited soot layer shows evidence of long wavy thickness variations that appears to be due to a soot re-entrainment and re-deposition moving bed type mechanism. The soot thickness increased and the long wavy variations persisted for larger soot thicknesses when the coolant temperature or wall temperature was lower. There was also evidence of larger soot thickness layer roughness for the lower wall temperature. These results could be due to an increase in the condensation of the vapour components at the lower wall temperature that may increase the soot adhesion. The heat transfer performance decreased faster for the lower coolant temperature, which is consistent with the soot deposition thickness measurement.
CitationCruz, E., Chang, J., Berezin, A., Ewing, D. et al., "Neutron Radiography Study of Diesel Engine Exhaust Soot Depositions in a Exhaust Pipe With and Without Water Coolant," SAE Technical Paper 2009-01-1533, 2009, https://doi.org/10.4271/2009-01-1533.
Combustion and Flow Diagnostics and Fundamental Advances in Thermal and Fluid Sciences, 2009
Number: SP-2238 ; Published: 2009-04-20
Number: SP-2238 ; Published: 2009-04-20
- Duernholz M., and Endres H., “Exhaust-Gas Recirculation. A Measure to Reduce Exhaust Emissions of DI Diesel Engines”, Transactions of SAE, Fuel Systems and General Emissions, 10, 151-158, 1992
- Lapuerta M., Hernandez J., and Gimenez F., “Evaluation of Exhaust Gas Recirculation as a Technique for Reducing Diesel Engine NOx Emissions.” Proc. Instn. Mech. Engrs, Part D Journal of Automobiles, 214, 85-93, 2000.
- Zheng M., Reader G. T. and Hawley J. G. “Diesel Engine Exhaust Gas Recirculation - A Review on Advanced and Novel Concepts,” Energy Conversion and Management, vol. 45, pp. 883-900, 2004.
- Hinds W. C., Aerosol Technology, Addison-Weslet, New York, 1982.
- Taulbee D. B. and Yu C. P., “Aerosol flow in rectangular channels”, Journal of Aerosol Science, 6, 433, 1975.
- Messerer A., Niessner R., and Poschl. U.. “Thermophoretic deposition of soot aerosol particles under experimental conditions relavant for modern diesel engine exhaust gas systems”, Journal of Aerososl Science 34 (8), 1009 – 1021, 2003.
- Beuthe T. G. and Chang J. S., “Gas discharge phenomena” In Handbook of Electrostatic Processes, Marcel Dekker Inc., New York, 1995.
- Ismail B., Ewing D., Cotton J. S. and Chang J. S., “Characterization of the Soot Deposition Profiles in Diesel Exhaust Gas Recirculation Cooling Devices Using a Digital Neutron Radiography Imaging Technique,” SAE 2004-01-1433, SAE Transactions, Journal of Fuel and Lubricants, 4, 791-800., 2004.
- dela Cruz E., Chang J.S., Ewing D., Berezin A.A., Cotton J.S., Gerges E. and Bardeleben M., “Neutron Radiography of Convective and Thermophoretic Diesel Engine Exhaust Soot Depositions in a Cooled Rectangular Chamber”, SAE Paper, 2008.
- Charles F., Ewing D., Chang J. S., Cotton J. S. and Becard J., “Optimization of the Exhaust Mass Flow Rate and Coolant Temperature for Exhaust Gas Recirculation (EGR) Cooling Devices Used in Diesel Engines,” SAE Paper, 2005-01-0654, 2005.
- Ismail B., Ewing D., Chang J. S. and Cotton J. S., “Development of a non-destructive radiography technique to measure the three-dimensional soot deposition profiles in diesel engine exhaust systems,” J. Aero. Sci., vol. 35, pp. 1275-1288, 2004.
- Ismail B., “The heat transfer and the soot deposition characteristics in diesel engine exhaust recirculation system cooling devices”, Ph.D. Thesis, McMaster University.
- Khaial A., Harvel G. D. and Chang J. S., “Neutron transport characteristics of a nuclear reactor based dynamic neutron imaging system,” Proc. ICONE-14, 89504, 2006.
- Von der Hardt P., and Rottger H., Neutron Radiography Handbook. Dordrecht, Holand: D. Reidel Publishing Company, 1981.
- Ismail B., Ewing D., and Chang J. S., “Modelling the deposition of the soot from diesel exhaust gas in the tubes of the heat exchangers” 53rd Canadian Chemical Engineering Conference, Hamilton, Canada, 2003.
- Hewitt G. F., Shires G. L., Bott T. R., Process Heat Transfer, CRC Press, New York, 1993.