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Date of Publication:2013-01-01

Journal:内燃机学报

Volume:31

Issue:4

Page Number:360-366

ISSN No.:1000-0909

Abstract:Diamond nanoparticles are added into the conventional engine oil to form
   a new type of nanofluids, which is further used as the cooling medium
   for piston gallery. Level Set method is introduced based on the
   traditional VOF method to achieve a new model. Transient heat transfer
   processes of diamond nanofluids with varied concentrations inside the
   piston gallery are discussed with a coupled arithmetic. Results show
   that addition of nanoparticles does not change the oil distribution
   obviously. However, due to the changes in the physical properties of the
   nano-oil, the overall heat transfer capacity is greatly improved. Heat
   transfer coefficients of diamond nano-oil with the volume fractions of
   1%, 2% and 3% increase by 2%, 29% and 44%, respectively. Numerical
   simulation agrees well with the empirical formula with maximum error of
   16.68%.

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