Experimental and numerical investigation of heat transfer and turbulent characteristics of a novel EGR cooler in diesel engine. (5th September 2016)

• Record Type: Journal Article
• Authors: Hoseini, S.S.; Najafi, G.; Ghobadian, B.
• Is Part Of: Applied thermal engineering. Volume 108(2016:Sep.)
• Page Start: 1344
• Page End: 1356
• Publication Date: 2016-09-05
• Subjects: Numerical heat transfer -- EGR cooler -- Nusselt number -- Heat transfer coefficient; Heat engineering -- Periodicals; Heating -- Equipment and supplies -- Periodicals; Periodicals; 621.40205
• DOI: 10.1016/j.applthermaleng.2016.08.018
• Languages: English
• ISSNs: 1359-4311

Abstract

Highlights: Heat transfer characteristics of three types of EGR coolers (Semi, Full spiral and Full-smooth) were investigated. Pressure drop in the F-Spiral EGR cooler is more than other EGR coolers. The F-spiral and S-spiral EGR cooler is suggested to be utilized in diesel engine. Heat transfer efficiency of the S-spiral is 0.17 higher than that of the F-smooth EGR cooler. The heat transfer efficiency of the S-spiral and F-spiral EGR cooler are same. Abstract: In this study, the flow and heat transfer characteristics of three types of EGR coolers including Semi-spiral EGR cooler (S-Spiral EGR cooler), Full-Spiral EGR cooler (F-Spiral EGR cooler) and Full-Smooth EGR cooler (F-Smooth EGR cooler) were investigated. The fluid and heat transfer properties of the new S-spiral EGR cooler system were studied experimentally and numerically using CFD, but the other two types, F-Spiral EGR cooler and F-Smooth EGR cooler were studied only numerically using CFD. Numerical simulation results showed that an acceptable compatibility exists between the experimental and the numerical results; such that for heat transfer efficiency, the difference between experimental and numerical results was reported to be about 8%, for Nusselt number, the difference between the experimental and numerical results was reported to be 6–8%, and for overall heat transfer coefficient, the difference between the experimental and numerical results was reported to be 9%. The experimental results of the study showed that for the newly built cooling system, S-spiral EGR cooler, the average heat transfer efficiency is 63.2%. The results showed that at a same flow rate, the heat transfer efficiency of S-spiral EGR cooler is more than F-Smooth EGR cooler, but the heat transfer efficiency of F-Spiral EGR cooler is more than the other two, also the pressure drop in F-Spiral EGR cooler is more than semi-Spiral EGR cooler and F-Smooth EGR cooler, therefore the use of the new cooling system (S-spiral EGR cooler) has many benefits, in term of pressure drop and heat transfer efficiency, over the other two types.