• Title/Summary/Keyword: Rotary Atomizer

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A Prediction Model of Droplet Size of Rotary Spray Dryer at Various Operating Conditions (원심식(遠心式) 분무건조장치(噴霧乾燥裝置)의 작동조건(作動條件)에 따른 분무입자(噴霧粒子)의 입도예측(粒度豫測) 모델)

  • Noh, S.H.;Kim, K.B.;Lee, J.W.;Lee, S.J.
    • Journal of Biosystems Engineering
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    • v.17 no.3
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    • pp.229-236
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    • 1992
  • In an effort to localize the spray-dryer which is markedly used for drying food materials, a experiment was carried out with a wheel type atomizer locally designed and manufactured to evaluate the effect of rotational speed, feed rate and physical properties of liquid food material on the droplet size, and to develop a model to predict the droplet size sprayed at various operational conditions. The result are summarized as follows. 1. The frequency of droplet size sprayed from the atomizer at every treatment were similar to normal distributions. 2. Under the test conditions adopted in this study, that is, rotational speed of the atomizer ranging from 15,000 to 20,000 rpm (55.0 m/sec - 73.3 m/sec), feed rate from 14 to 37 kg/hr and viscosity of the material from 1.14 to 350 cP, the mean volume-surface dia. of droplets was decreased as increase in rotational speed and was not affected significantly by the feed rate and viscosity. 3. Through the dimensional analysis, a prediction model was developed as follows : $$\frac{Dvs}{r}=K[\frac{Q}{{\mu}r}]^a[\frac{rN^2}{g}]^b[\frac{{\rho}^2r^3g}{{\mu}^2}]^c[\frac{L}{r}]^d$$ and it was proved that the above model was better in degree of fitness than other models reported. 4. A prediction equation for the droplet size sprayed from the atomizer under the test was expressed as follows : $$\frac{Dvs}{r}=0.0215[\frac{Q}{{\mu}r}]^{0.06}[\frac{rN^2}{g}]^{0.3314}[\frac{{\mu}^2}{{\rho}^2r^3g}]^{0.0158}$$.

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A Study on the Centrifuge Fabrication for a Nano Size Particle Having a Central Supply Tube (중앙 투입 형식의 나노급 입자 원심분리기 제작에 관한 연구)

  • Hwang, Gyo-Seon
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.19 no.4
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    • pp.576-581
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    • 2010
  • As a super high speed small-sized centrifugal separator which is operated by the center inputting method has solved two difficulty problems, it can be made use of developing the new composition through the making of Nano particle (50~100nm) by high speed revolution and alleviation of unbalanced shapes inside the disk continuously throwing slurry in the central part. Uses the air spindle and the centrifugal machine production will be able to manufacture the Roh class fine particle under boil.

The proposal for pesticide exposure estimation of Korean orchard farmer (과수 농작업자 농약노출량 산정법 제안)

  • Hong, Soon-Sung;Lee, Je-Bong;Park, Yeon-Ki;Shin, Jin-Sup;Im, Geon-Jae;Ryu, Gab-Hee
    • The Korean Journal of Pesticide Science
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    • v.11 no.4
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    • pp.281-288
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    • 2007
  • This research was carried out to propose the Korean method for estimating the agricultural occupational pesticide exposure level in orchard. The UK-POEM (UK-Predictive Operator Exposure Model) was proposed as a bench-marking model and analysed its performance properties. To extrapolate the Korean agricultural conditions, application equipment, application method, work rate per day, application volume and spraying time of pesticide was surveyed for Korean 204 orchard farmhouse. This survey indicate that the major application equipments are speed sprayer(64.9%) and motor sprayer(33.9%). When they spayed the pesticide with a speed sprayer, they worked for more than 4 hours on area of 4 ha per day. In case of using motor sprayer, they worked for more than 4 hours on area of 1 ha. Based on the above survey result, Korean method for estimating the pesticide exposure level of agricultural worker was proposed finally.