Comparative Study on Experiment and Simulation of the Flow Characteristics of Air Nozzles Used in Lithium Battery Film Drying Device

doi:10.3901/JME.2015.24.105

Abstract

Abstract: For the purpose of getting the resistance characteristics and flow equalization characteristics of air nozzles used in lithium battery film drying device and verifying the trueness of numerical simulation results, the experimental cases for nozzles characteristics which have the same structure and size as simulation models are built with acryl glass according to the geometric similarity. The kinematic similarity is ensured through using the inlet flow rate and outlet pressure equal to numerical simulation as boundary conditions. The air nozzles’ resistance characteristics are obtained by calculating the differential pressure between the inlet and outlet under different flow rate. The wind velocities along the nozzles’ outlets are measured by hot wire anemometer and the air nozzles’ flow equalization characteristics on air are obtained. The experimental results have a higher compatibility with numerical simulation results：Under the same whole size and running conditions, the air nozzle which has bottom sieve plate and inner stopper has a lower resistance and the highest flow equalization characteristics, the differential pressure range between the inlet and outlet is 33-524 Pa and the uniformity index is above 95%. The air nozzle which has upper round air outlets and bottom sieve plate but has not the inner stopper has the lowest resistance and the lowest flow equalization characteristics, the differential pressure range between the inlet and outlet is 24-354 Pa and the uniformity index is 80.4% and can not reach the operating requirements. The air nozzle which has not bottom sieve plate and inner stopper but has many narrow outlets has the highest resistance which can not reach the drag reduction requirements and a higher flow equalization characteristics, the differential pressure range between the inlet and outlet is 203-3 234 Pa and the uniformity index is above 91.1%. The internal relations between the flow equalization action and the pressure loss are discussed. The principle for the selection and adjustment of air nozzles in working is proposed.

Key words: air nozzle, film drying, lithium battery, resistance characteristic, uniformity

LI Xujia, GAO Dianrong, WANG Huashan. Comparative Study on Experiment and Simulation of the Flow Characteristics of Air Nozzles Used in Lithium Battery Film Drying Device[J]. Journal of Mechanical Engineering, 2015, 51(24): 105-111.

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