Temperature measurement control problem of vibrational viscometers considering heat generation and heat transfer effect of oscillators

Abstract

In viscosity measurement, temperature control is very important. In this research, temperature distribution effect of vibrational viscometers was analyzed. Vibrational viscometer was designated amongst other viscometer types due to inexpensiveness, handiness and efficacious continuous viscosity measurement capability. The research was conducted in three parts. In the first part; heat generation problem of boundary layers of oscillators of vibrational viscometers was analyzed. Experiments prove that due to the friction between the oscillators and the fluids, heat is generated from the vibrational boundary layer of the oscillators. In the second part, unequal temperature distribution problem of vibrational viscometers was analyzed. When heater generates heat during continuous viscosity measurement, temperature disperses every part of a fluid and affects the viscosity of the fluid. Therefore, it may not be possible to acquire a homogenous viscosity value from a fluid since temperature distribution cannot be equal at every point of a standard fluid. Experimental outcomes and mathematical calculations have also strengthened this conclusion. In the last part of the research, in order to solve the unequal temperature distribution problem, it is proposed to utilize a magnetic stirrer which will mix up the fluid throughout the viscosity measurement and constitute homogenous temperature.