{"created":"2021-03-01T06:44:08.856439+00:00","id":8693,"links":{},"metadata":{"_buckets":{"deposit":"c6be0a92-a42b-492d-a815-77b4670e4139"},"_deposit":{"id":"8693","owners":[],"pid":{"revision_id":0,"type":"depid","value":"8693"},"status":"published"},"_oai":{"id":"oai:tsukuba.repo.nii.ac.jp:00008693","sets":["3:233:244"]},"author_link":["35664"],"item_12_biblio_info_6":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2003","bibliographicIssueDateType":"Issued"}}]},"item_12_date_granted_46":{"attribute_name":"学位授与年月日","attribute_value_mlt":[{"subitem_dategranted":"2003-03-25"}]},"item_12_degree_grantor_44":{"attribute_name":"学位授与大学","attribute_value_mlt":[{"subitem_degreegrantor":[{"subitem_degreegrantor_language":"ja","subitem_degreegrantor_name":"筑波大学"},{"subitem_degreegrantor_language":"en","subitem_degreegrantor_name":"University of 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Engineering","subitem_degreename_language":"en"}]},"item_12_description_4":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"本研究では，蒸気爆発現象において蒸気爆発を引き越すか引き起こさないかを決定付けるトリガリング挙動の一つである，粗混合状態における高温粒子表面上の蒸気膜崩壊挙動の微視的機構について注目する。これまでに，高温物体表面上の蒸気膜の崩壊挙動に関してはさまざまな実験的研究がなされている。これらの研究の多くは溶融金属を用いているために蒸気爆発に続いて微粒化が発生していたり，また，固体物質を用いた実験でも円筒形状または平板形状の固体物質を用いた実験が行われている。しかしながら，高温粒子は球形に近い形状をしており，球上の蒸気膜崩壊挙動について調べる必要がある。そこで，まず初めに，高温粒子を模擬した金属球を用いて蒸気膜の崩壊挙動を調べることとする。従来の研究とは異なり，高温粒子を模擬した物体として金属球を用いることによって，溶融液滴を用いた実験では見られた微粒化の影響を排除した状態での蒸気膜の崩壊挙動の観察が可能である。この高温の金属球表面上に蒸気膜を形成させ，自発的に崩壊した場合ならびにトリガとなる圧力パルスが作用した場合，この蒸気膜がどのような挙動で崩壊するかを微視的に観察を行うこととする。また，蒸気膜の崩壊挙動は低温液のサブクーリングに影響を受けるとされているが，この蒸気膜の崩壊挙動が低温液のサブクーリングに対してどのような影響を受けるかを微視的に観察を行うこととする。 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