فهرس المقالات Coolant

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  1 - Experimental and Analytical Study of Aluminum-oxide Nanofluid Implication for Cooling System of an Amphibious Engine
  Mohamad Najafi M. Najafi
  The aim of this manuscript is to study the implication of aluminium-oxide nanofluid for an amphibious vehicle engine (viable on land and under water) cooling system both analytically and experimentally. To achieve this, a one-dimensional model of the engine cooling syst أکثر

  The aim of this manuscript is to study the implication of aluminium-oxide nanofluid for an amphibious vehicle engine (viable on land and under water) cooling system both analytically and experimentally. To achieve this, a one-dimensional model of the engine cooling system (radiator) is considered through a computational fluid code in which the mass flow rate for a range of the coolant temperature is assumed to be constant. By knowing the volumetric flow rate of the air passing over the radiator, the heat transfer rates for different aluminium-oxide nanofluid volume concentrations at different amphibious engine gears are determined. The analytical results indicate that a 7% aluminium-oxide nanofluid increases the engine radiator heat transfer performance by 24.9%, while the experimental results show that the coolant outlet temperature is about 3˚C lower than the case without the nanofluid in the coolant. تفاصيل المقالة
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  2 - Study the Effects of Nano Fluid as a Coolant in Milling Process for Improving Machining Parameters
  احمد افسری امیرحسین زارعی
  The aim of this research work is to evaluate the effects of coolant including nano- powder material for the cooling purpose in milling process and comparing the results with the conventional coolant. Generation heat and weak heat transfer reduces the tool life and also أکثر

  The aim of this research work is to evaluate the effects of coolant including nano- powder material for the cooling purpose in milling process and comparing the results with the conventional coolant. Generation heat and weak heat transfer reduces the tool life and also deteriorate surface roughness during milling operation. To overcome this problem, it is necessary to use coolant for cooling as well as lubrication purposes. Due to limited heat removal rate from the work piece through the conventional coolant, some nano powder material is added to coolant, to improve the heat transfer coefficient. The added nano powder also increases machinability, decreases production time and improve surface roughness. In this paper nano fluid of copper with 99 percent purity added to Z1 coolant for machining of St37 work piece in milling machine. In this research, some factors such as rotational speed, feed and depth of cut in the three states of machining, with different coolant including Z1 and nano fluid and dry condition were investigated and finally temperature of machined work piece and its surface quality were evaluated. By comparing the obtained results it is evident that the heat removal rate and surface quality in the case of nano fluid are improved and furthermore the tool life as well as machining efficiency increases. تفاصيل المقالة