A previous TLT article discussed research into the use of carbon nanotubes in heat transfer fluids based on water glycol, petroleum oil and polyalphaolefins (PAOs).1 Use of these nanotubes at a 1% treat rate in 15W-40 diesel oil boosted the thermal conductivity by more than 45%. When asked to apply his rules for refrigeration lubricant selection, discussed in a prior TLT article, Kedzierski indicated that the reason for the improved performance with diamond may be due to a dramatic boost in viscosity.2 He says, "The viscosity of the nanoparticle-based lubricant/refrigerant mixture with diamond is more than double the value seen with CuO."
Improving refrigeration with nanoparticles Neil Canter Tribology & Lubrication Technology; Nov 2008; 64, 11; Docstoc pg. 14 Reproduced with permission of the co
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