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Presented here is a protocol that guarantees uniform distribution of initial moisture inside of a fabric and investigates the effects of hot-air thermodynamic parameters (velocity, temperature, and direction) and thickness on the fabric's drying characteristics (e.g., temperature variation) under the condition of air impingement.
Impinging dryness is now a widely used and effective way for fabric drying due to its high heat and mass transfer coefficient. Previous studies on fabric drying have neglected the contributions of moisture uniformity and diffusion coefficient to the drying process; though, they have recently been shown to have a significant influence on drying characteristics. This report outlines a step-by-step procedure to investigate the effects of air impingement parameters on a fabric's drying characteristics by controlling the uniformity of its area moisture distribution. A hot air blower unit equipped with an angle adjustable nozzle is used to generate air flow with different velocities and temperatures while the drying process is recorded and analyzed using an infrared thermograph. In addition, a uniform padder is adapted to ensure the fabric's moisture uniformity. Impinging drying is studied under different initial conditions by changing the air flow temperature, velocity, and direction, then the applicability and suitability of the protocol are evaluated.
Impinging drying is a very effective drying method due to its high heat, mass transfer coefficient, and short drying time. It has attracted extensive attention due to its numerous applications including chemical industry, food1, textile, dyeing2, paper making3,4, etc. Now, impinging drying is widely used for its enhanced transport characteristics, especially for the drying of textiles in the heat setting process5.
Fabric is impinging dried by the nozzle array for the heat setting. Nozzle layout affects the unifo....
1. Experimental rig set-up
NOTE: See Figure 1.
The data presented in Figure 2 are typical temperature contours for cotton fabric at different drying stages under the condition that air velocity and temperature at the nozzle outlet are 20.0 m/s and 120 °C, respectively. It can be figured from Figure 2A,B,C,D that under the air impingement drying, temperature decays from the center to the periphery and forms sets of concentric circles. Meanwhile, temperatu.......
This section provides a few tips necessary to ensure reliable quantitative results. First, the fabric specimens must be kept completely dry to ensure the initial weights are correct. This is achievable through the drying process (i.e., using a suitable drying stove). If possible, an environment humidity that is kept constant benefits the experiment.
Secondly, the fabric specimens must be well-processed to ensure that the moisture at each region of the fabric is uniform. This can be done by man.......
This work was supported by the NSFC-Zhejiang Joint Fund for the Integration of Industrialization and Informatization (grant number U1609205) and National Natural Science Foundation of China (grant number 51605443), the Key Research and Development Project of Zhejiang Province (grant number 2018C01027), the 521 Talent Project of Zhejiang Sci-Tech University, and the Young Researchers Foundation of Zhejiang Provincial Top Key Academic Discipline of Mechanical Engineering of Zhejiang Sci-tech University (grant number ZSTUME02B13).
....Name | Company | Catalog Number | Comments |
Air Blower | Zhejiang jiaxing hanglin electromechanical equipment co., Ltd. | HLJT-3380-TX10A-0.55 | Air Volume: 900 m3/s; |
Anemometer | KIMO | MP210 | Measurement range: 0-40 m/s; Accuracy: ±0.1 m/s |
Drying stove | Shanghai Shangyi Instrument Equipment Co., Ltd. | DHG 101-0A | precision: 1 °C; Temperature control range:10-300 °C |
Electronic Balance | Hangzhou Wante Weighing Instrument Co., Ltd. | WT1002 | Precision: 1 °C; Range: 100 g |
Fabric Style Measuring Instrument | SDL Atlas | M293 | |
Fabric Touch Tester | SDLATLAS Ltd | Fabric thickness tester | |
High thermal resistance board | Baiqiang | Flame resistance, Heat resistance is greater than 200 °C | |
High-temperature resistant silicon pipeline | Kamoer | 18# | Temperature range: -60-200 °C |
Infrared Thermogragh | Hangzhou Meisheng Infrared Optoelectronic Technology Co., Ltd. | R60-1009 | Temperature measuring range: -20-410 °C; Maximum measuring error: ±2 °C |
Padder | Yabo textile machinery co., Ltd. | Roller pressure: 0.03-0.8 MPa; Stable pressure; Easy adjustment | |
Personal Computer | Lenovo Group. | L460 | |
Temperature Sensor | Taiwan TES electronic industry co., Ltd. | 1311A | resolution: 1 °C; Temperature measuring range: -50-1350 °C |
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