Análise de um sistema de medição da vazão mássica de LN2 para uso em usinagem

Abstract

The major aim of this work is to quantify the flow rate of liquid nitrogen by means of load cells integrated into a system for machining application. A specific software of the manufacturer of the load cells records and stores the mass variation as a function of time. From the collected values, curves of linear regression are obtained for each test referent to each opening condition of the valves, which let to calculate the mass flow through the ratio between the consumed mass and the time. The volumetric flow is obtained through the ratio between the density of liquid nitrogen and the mass flow in order to analyze the costs and economic aspects of the liquid nitrogen consumption. The work allowed the mass flow determination for various opening conditions of the system, obtaining a mass flow of 16,58 l/h for the minimum opening condition of the valves. The system used in this work belongs to the Manufacturing Laboratory of UFRN.