안녕하십니까.  BK 연구단 입니다.  아래와 같이 해외 전문가 초청 세미나

예정 되어 있습니다. 관심 있는 학생 분들의 참여 바랍니다.

- 아     래 -

1. 일    시 : 2024년 3월  28일(목)  오후4시30분~

(5분 전 착석 부탁드립니다.)     

2. 장    소 : 기계관906호 -> 408호로 변경 되었습니다.

3. 연사 및 직급 : Professor. Yasuyuki Takata

  -소속 : Kyushu University, Japan

4. 강 연 주 제 : On the Quenching of Spray Cooling

-When does it occur?-

Abstract: Spray cooling is often used in various industrial processes such as in water cooling of hot slabs in iron-and-steel making industries. During the cooling process of the steel surface initially at a high temperature, the cooling mode of sprayed water changes from film boiling regime to nucleate boiling via “quenching point” where rapid cooling occurs by the direct contact between liquid and hot surface. It is of great importance predict the quenching point. Despite a number of previous studies, the mechanism of onset of quenching has not yet been clearly understood. One of the reasons is due to the oxide layers formed on the hot surface. These oxide layers have non-uniform porous structure and low thermal conductivity and hence increase the quenching temperature. In the present study, we try to explain the quenching temperature based on the assumption of the transient heat conduction for a contact between two semi-finite bodies. We used several different artificial oxide layers and made a series of experiments on spray cooling and observation of single individual droplet impinging onto the hot oxide surfaces. As a result, the onset of quenching always seems to happen at the contact surface temperature of around 250°C regardless of the composition and thickness of the oxide layer.

5. 주    최 : 첨단기계부품소재고급인력교육연구단​

6. 추 천 교 수 : 정 지 환 교수님

  • 24.1.1일 부터 BK 세미나  "참석확인서"는 해당 본인이 직접 들고 가셔서, 추후 졸업 시점 등에 세미나 참석 횟수 확인 증빙으로 활용하시기 바랍니다.  (BK에서는 24.1.1일 이후 세미나 참석 횟수 확인을 별도로 해드리지 않습니다.)

•​ 방명록 작성시 성명, 지도교수명을 바르게 써주세요 (흘림글씨체의 경우 확인이 불가 합니다.)

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