Sound field enhanced air flow drying and boundary layer measurement integration experiment system

Abstract

The invention discloses a sound field enhanced air flow drying and boundary layer measurement integration experiment system comprising a dry air circulation device, a replaceable air flow distribution device, a sound wave generating device, a dried object weight measurement device, and a boundary layer measurement device. The dried object weight is measured by a precision balance disposed on a drying box, and an air circulating fan is communicated with the drying box by an inlet air circulation pipeline and an outlet air circulation pipeline to form a closed loop. The boundary layer measurement device is constituted by a thermistor thermometer C inserted in the air flow pipeline, a pitot tube, and a shifter. The outlet air circulation pipe is provided with a pore plate flowmeter. By adopting the experiment system provided by the invention, the drying rate curve of the dried object can be determined under the constant drying condition, the influences of the flow field and the sound wave on the drying process can be inspected, and the speed boundary layer and the temperature boundary layer can be measured. The experimenter can master the definition and measurement method of the object drying rate, the speed boundary layer, and the temperature boundary layer by using the experiment system.

Description

technical field [0001] The invention belongs to the technical field of drying, and relates to airflow drying, in particular to an integrated experimental system for airflow drying and boundary layer measurement with replaceable airflow field and sound field. Background technique [0002] The airflow drying experimental equipment is mainly used to measure the drying characteristics of the material, including the drying curve and drying rate curve, which is helpful to understand the nature of the moisture contained in the material and grasp the basic law of material drying. The resistance of the airflow drying process is mainly concentrated in the boundary layer. By measuring the air velocity distribution and temperature gradient distribution of the boundary layer, the definition of the boundary layer and its significance in heat and mass transfer and drying process can be understood. The airflow drying process is closely related to the flow field of the airflow. The latest r...

AI Technical Summary

Problems solved by technology

For the existing boundary layer measurement system, when measuring the temperature gradient of the boundary layer, due to the continuous heating effect of the hot wind on the surface of the heated object, the temperature of the wall near the heated object continues to increase, making it difficult to determine the temperature gradient of the boundary layer

At this stage, there is no airflow drying and boundary layer measurement integrated in one system

Images