Measurement of viscosity of liquid in micro-crevice

Due to effect of solid surface the liquid in small micro-crevice exhibit higher viscosity than bulk value, the viscosity increase as micro-crevice thickness decreases.The viscosity of the liquid in small micro-crevice calculated with conventional methods has fine accuracy and repeatability when micro-crevice thickness is big and fixed, but these methods cannot be applied for the liquid in small micro-crevice thickness.Due to over-effect of micro-crevice thickness on viscosity of liquid calculated with conventional methods deduced from physics do not indict the nature of the liquid in small micro-crevice a new calculating method based on colloid and surface science should be developed.

A measurement of viscosity and rheology of a liquid confined within tight space with scientific accuracy typically has been a challenge. In order to measure viscosity of the liquid in micro-crevice at low shear rate a micro-crevice viscometer (MCV) is developed by modifying an interfacial-viscometer. The viscosity of water and hydrocarbons (C10, C12, C14 and C16) was measured with the viscometer in this study. The results show that the viscosity measured at low shear rate by the micro-crevice viscometer and calculated with conventional methods has fine accuracy and repeatability when micro-crevice thickness is big and fixed. The liquid in small micro-crevice or confined within small space exhibit higher viscosity than bulk value and the viscosity should increase as the micro-crevice thickness decreases. Due to over-effect of h on viscosity calculation leads to water and hydrocarbons viscosity decrease as h decreases which do not indict the nature of the liquids in micro-crevice or confined within small space, a new calculating method based on influence of solid surface on liquid should be developed.