低剪断性混合装置の開発と剪断特性評価法の確立

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Author: 森, 茂ほか

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Publication date: 2002-03-25

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Note (General)：: 金沢大学理工研究域機械工学系温和な混合を達成する低剪断性混合装置の開発を最終目標として、剪断性が小さい水力輸送用ポンプのスクリュー型羽根車を混合用の攪拌翼に改作し、それを設置した攪拌槽の混合特性を把握するとともに、槽内の剪断作用を定量的に評価するアルギン酸ビーズ破損法を新たに提案し、その有効性につい...

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https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-11650775/116507752000kenkyu_seika_hokoku_gaiyo/

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Material Type: 文書・図像類
Title: 低剪断性混合装置の開発と剪断特性評価法の確立
Author/Editor: 森, 茂
Mori, Shigeru
Author Heading: 森, 茂
Mori, Shigeru
Publication Date: 2002-03-25
Publication Date (W3CDTF): 2002-03-25
Alternative Title: Development of Mixer for Weak Shear Mixing and Evaluation of Shearing Strength in the Mixing Vessel
Periodical title: 平成12(2000)年度科学研究費補助金基盤研究(C) 研究成果報告書概要 = 2000 Fiscal Year Final Research Report Summary
No. or year of volume/issue: 1999-2000
Volume: 1999-2000
Pages: 2p.-
Text Language Code: jpn
Subject Heading: 混合装置
剪断特性
スクリュー型翼
混合完了時間
撹拌所要動力
アルギン酸ビーズ
Rotational Speed
Impeller Reynolds Number
Mixer
Shearing Strength
Screw impeller
Calcium Alginate Gel
Mixing Time
Agitation Power
Target Audience: 一般
Note (General): 金沢大学理工研究域機械工学系
温和な混合を達成する低剪断性混合装置の開発を最終目標として、剪断性が小さい水力輸送用ポンプのスクリュー型羽根車を混合用の攪拌翼に改作し、それを設置した攪拌槽の混合特性を把握するとともに、槽内の剪断作用を定量的に評価するアルギン酸ビーズ破損法を新たに提案し、その有効性について検討を行った結果、「低剪断性攪拌槽の開発」1)スクリュー型翼攪拌槽の混合性能は、翼およびサクションコーンの形状・相対的位置関係、槽寸法、攪拌母液の液深等に左右され、最適な条件が存在すること、2)混合完了時間や攪拌所要動力等の混合特性は母液粘度と翼回転数の影響を受けるが、回転数が少ない場合の所要動力は液粘度にあまり依存しないこと、3)無次元混合完了時間は攪拌Re数によらずほぼ一定値を示し、スクリュー型翼の場合の値は、傾斜パドル翼に比べて低く、混合性能に優れること、4)動力数と攪拌Re数の積は一定値で表現できること、などが明らかとなった。また、「混合槽における剪断作用の定量化」5)水および水飴水溶液を溶媒とするアルギン酸ナトリウム溶液を塩化カルシウム水溶液中に滴下して得られるアルギン酸ビーズは、混合槽内において攪拌に伴う剪断作用により徐々に破損するため、その破損個数の経時的変化を追跡することで見掛けの槽内剪断作用を定量的に評価できること、6)スクリュー型翼混合槽における攪拌母液に対する見掛けの剪断作用は、蒸留水混合の場合はディスクタービン翼(邪魔板併用)に比べ、粘性の高い水飴水溶液の場合は傾斜パドル翼に比べてそれぞれ小さいこと、などが判明した。
In this research, we proposed a new mixer with a screw impeller, which has been practically used as a pump vane, for weak shear mixing and discussed its mixing behaviors. Experimental results show that mixing performance of the screw impeller is affected by shapes of the impeller and a suction cone, impeller position, vessel size and liquid depth, and there is an optimum condition for good mixing by this impeller. The mixing time and the agitation power in the vessel with the screw impeller are influenced by the viscosity of the mixed liquid and rotational speed of the impeller, and the agitation power hardly depends on the liquid viscosity in the lower rotational speed range. The screw impeller has a good mixing performance because of short dimensionless mixing time, compared with a pitched paddle impeller. The product of the power number and the impeller Reynolds number was found to be a constant value.Furthermore, a new method using spherical gels of calcium alginate for measuring the shearing strength in the mixing vessel was proposed, and its validity was also discussed in this study. The calcium alginate gels were gradually damaged by the shear stress in the vessel, Therefore, an action of shear mixing in the vessel could be quantitatively determined by examining the time course of the number of the damaged gel particles. For water mixing the complete breaking time of the gel particles in the vessel with the screw impeller was longer than that with a disk turbine impeller, and for mixing of an aqueous solution of glutinous starch syrup having the viscosity of 9.8 Pa.s the initial breaking rate of the gels for the screw impeller was lower than that for the pitched paddle impeller. Consequently, the proposed mixer with the screw impeller can achieve a weak shear mixing.
研究課題/領域番号:11650775, 研究期間(年度):1999-2000
出典：研究課題「低剪断性混合装置の開発と剪断特性評価法の確立」課題番号11650775（KAKEN：科学研究費助成事業データベース（国立情報学研究所））（https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-11650775/116507752000kenkyu_seika_hokoku_gaiyo/）を加工して作成
DOI: 10.24517/00057193
Access Restrictions: 限定公開
Related Material: https://kaken.nii.ac.jp/search/?qm=50019759
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650775/
https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-11650775/116507752000kenkyu_seika_hokoku_gaiyo/
Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）
https://irdb.nii.ac.jp
Original Data Provider (Database): 金沢大学 : 金沢大学学術情報リポジトリKURA