scholarly journals Effect of Deposits on Heat Transfer Performance of EGR Cooler for Diesel Engine(Thermal Engineering)

2009 ◽  
Vol 75 (758) ◽  
pp. 2083-2088 ◽  
Author(s):  
Yoshitaka SHIBASAKI ◽  
Atsushi SUGIMO ◽  
Naoya GOTO ◽  
Masataka ARAI
2020 ◽  
Vol 9 (1) ◽  
pp. 66-74
Author(s):  
Hossam A. Nabwey

In recent years, considerable attention has been paid towards the nanotechnology research, which is an emerging area of research with many industrial and engineering significance. The nanofluids which use metallic nanoparticles to enhance the thermal extrusion system are considered as bio-friendly, durable and sustainable products. Nanofluids are engaged in fundamental applications like nuclear reactors, medical agents, material fabrication, chemical industries, geo-thermal engineering, petroleum industries etc. In recent years, a variety of experimental and theoretical computations were performed to explore the thermophysical aspects of such nanoparticles. Further, flow of nanoparticles containing gyrotactic microorganisms has interesting applications in microbial fuel cells, bio-technology and enzyme biosensors. The main purpose of the present paper is to use the rough sets theory to generate a set of rules to predict the heat transfer performance of a third grade nanofluid in thermally developed flow with gyrotactic microorganisms. The rough set reduction technique is applied to find all reducts and then a set of generalized rules is extracted to predict the value of local Nusselt number, local Sherwood number and motile density number. The generated results shows that our method can effectively predict these values with high accuracy and may be valuable in many engineering applications like power production, thermal extrusion systems and microelectronics.


2015 ◽  
Vol 19 (6) ◽  
pp. 2025-2037 ◽  
Author(s):  
Zhong-Gen Su ◽  
Wei Zheng ◽  
Zhen-Dong Zhang

To improve the heat-transfer performance of a diesel-engine cylinder head, nanofluid coolant as a new fluid was investigated, and jet impingement technology was then used to study on how to better improve heat-transfer coefficient at the nose bridge area in the diesel-engine cylinder head. Computational fluid dynamic simulation and experiments results demonstrated that using the same jet impingement parameters, the different volume shares of nanofluids showed better cooling effect than traditional coolant, but the good effect of the new cooling method was unsuitable for high volume share of nanofluid. At the same volume share of nanofluid, different jet impingement parameters such as jet angles showed different heat-transfer performance. This result implies that a strong association exists between jet impingement parameters and heat-transfer coefficient. The increase in coolant viscosity of the nanofluid coolant using jet impingement requires the expense of more drive-power cost.


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