Method and device suitable for measuring specific heat capacity at constant pressure of dissolved gas flow

Abstract

The invention discloses a method and device suitable for measuring the specific heat capacity at constant pressure of dissolved gas flow. The device comprises a liquid container, a preheater, a mixingcavity, a calorimeter, a condenser and a gas sample bottle, wherein the liquid container, the preheater and the mixing cavity sequentially communicate one another, and the mixing cavity communicateswith the calorimeter and the gas sample bottle; the calorimeter communicates with the condenser to the liquid container through a pipeline to form a circulation loop; the preheater, the mixing cavityand the calorimeter are all arranged in a thermostatic bath with circulating fan blades; and the calorimeter is connected with a data acquisition system and a direct-current power supply. By adoptingthe closed loop design, the constant components of the gas-dissolved liquid in the system are realized by using the mixing cavity and the circulating pump, so that the effective and accurate measurement of the specific heat capacity at constant pressure of the fluid is realized.

Description

technical field [0001] The invention belongs to the field of measurement of thermal physical properties of fluids, and relates to a method and a device for measuring heat capacity of dissolved air fluid at high pressure and constant pressure based on flow type calorimetry. Background technique [0002] Specific heat capacity at constant pressure refers to the enthalpy change that occurs when a unit mass of an object changes unit temperature under constant pressure. Specific heat capacity at constant pressure is a basic thermodynamic property of matter, and it has important practical applications in the fields of aerospace, energy and chemical industry. At present, in order to accurately obtain the experimental data of specific heat capacity at constant pressure, the main experimental methods used are flow calorimetry, quasi-steady state method and differential scanning calorimetry. [0003] Among various methods, flow calorimetry has the advantages of high measurement accur...

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Problems solved by technology

[0005] The purpose of the invention is to provide a method and device for measuring the ratio of heat capacity of dissolved gas fluid to constant pressure, to solve the problem that the existing flow-type calorimetry method is difficult to maintain the constant composition of the mixed fluid, to reduce the measured working medium consumption, and to achieve stable, Accurate and economical experimental measurements

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