| Viscosity is the state of being thick,sticky and semi-solid in consistency due to internal fraction.In physical term,it is the property of a fluid that resists the force tending the cause of fluid of flow.Viscosity is the main basis of all kinds of marine equipment to choose oil,it directly influences the lubrication effect of lubricating oil,diesel engine fuel atomization effect and running effect of ship air compressor oil and so on.But traditional viscosity measurement method is not suitable for online measurement due to its defect such as big measurement error,uneasy to realize automatic control and complex.In order to be able to realize online detection of lubricating oil,this paper take white oil(100#)as reference fluid,using Y type of microfluidic channel.The microfluidic device had two inlets,for the introduction of the sample and reference fluids,respectively,and a mixing channel.The paper used the phenomenon of two phase laminar diffusion in the process of parallel flow in the mixing channel.By means of microscopic image researching,the paper got the characteristics of two phase interface under the condition of different flow velocity,viscosity ratio and surface tension ratio.The paper made use of the finite element software Fluent to get the velocity and trajectory simulation of two phase fluid and compared with the experimental data to analyze the specific relationship between oil viscosity,velocity,flow and two phase interface in the microfluidic channel.For accurately identifying fluid viscosity,an effective design criterion is discussed using an enhanced mathematical model for complex fluid networks.The mathematical model of lubricating oil viscosity is established based on the Mat-lab,thus to realize the continuous measurement of the lubricating oil viscosity index on lab-on-chip,and provide the experimental basis and technical parameters for the study of the technology of lubricating oil viscosity detection unit based on microfluidic chip. |
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