Experimental investigation on the macroscopic spray and microscopic droplet diameter, velocity and temperature of R404A flashing spray
发布时间：2025-04-30
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- 发布时间：
- 2025-04-30
- 论文名称：
- Experimental investigation on the macroscopic spray and microscopic droplet diameter, velocity and temperature of R404A flashing spray
- 发表刊物：
- International Journal of Heat and Mass Transfer
- 摘要：
- Two-phase flashing spray elicits wide interest in scientific and industrial fields. It can produce fine at- omization with small size and low temperature droplets because of explosive atomization and strong evaporation. This study conducted an experimental investigation on the macroscopic spray and micro- scopic droplet diameter, velocity, and temperature through various measurement methods with a low saturation-temperature refrigerant R404A, which holds a special interest in laser dermatology. The spray presented a bowl spray configuration with rapid expansion at the nozzle exit. A core spray area near the nozzle field was revealed, in which the droplet Sauter mean diameter ( D 32 ) and temperature ( T d ) decreased rapidly while the droplet average velocity ( V ) exhibited an obvious acceleration with increas- ing axial distance. All the number distributions of droplet diameter and velocity presented Gaussian shapes. The cumulative distribution of droplet diameter followed the Rosin–Rammler correlation per- fectly. The uniformity constant and characteristic droplet size were proposed for various axial and radial positions. The radial distributions of D 32 , V , and T d at various spray axial sections presented different pro- files, among which the non-dimensional profiles of V showed a self-similar pattern. The two-dimensional thermal field presented a contractive pattern and a narrow spray width after the rapid expansion at the nozzle exit, which helped to control the spray cooling area more precisely compared with other expansion-like sprays with larger spray width. Experimental data could also provide validation data for the numerical simulation of flashing spray.
- 合写作者：
- Zhou Z F, Yin J, Yang X Y, et al.
- 是否译文：
- 否
- 发表时间：
- 2021-05-31