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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

Study on diesel cylinder-head cooling using nanofluid coolant with jet impingement