Newtonian or shear-thinning oils for screw-type compressors?

Abstract

With the application of oils with useful dynamic viscosities and special oil characteristics, operators of screw-type compressors have the possibility of decreasing the power consumption and to improve the machine's behaviour at various speeds. The idea was to adapt the oil viscosity to the compressor's rotational speed in order to reduce power loss. On the basis of this idea, research was carried out on shear-thinning oils in screw-type compressors. Thus this article is based on the theory that viscosity regulation, related to rotational speed, can be used to improve the sealing effect of the clearances at lower speeds and to decrease hydrodynamic losses at higher speeds. Using a Newtonian oil this aim cannot be achieved. Only shear-thinning oils can help to solve this problem. This article will deal with this subject.

Keywords

Newtonian oils shear-thinning oils screw-type compressors

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