Measurement of the Overall Volumetric Coefficient of Heat Transfer of a Shaking Flask : Performance of the Shaking Flask (III)

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The overall volumetric coefficient of heat transfer (Uα) of a shaking flask was measured under various shaking conditions using three types of flask. Uα was significantly affected by flask weight (W_F), which could be attributed to the thickness of the flask wall, the rotational speed of the shaker (N), wind velocity (V_W), and the liquid volume in the flask (V_L). The limiting step of heat tranfer seemed to be the heat radiation process from the surface of the flask to the surroundings. To predict the value of Uα, the following empirical equations were obtained for each type of flask by the least squares method : (1) for deformed creased flask (M-type flask), Uα=17.4 W_F^<-0.43>V_L^<-0.61>N^<-0.12>V_W^<-0.36>(2) for creased flask (N-type flask), Uα=9.2 W_F^<-0.36>V_L^<-0.57>N^<-0.17>V_W^<-0.27>(3) for smooth flask (S-type flask), Uα=5.3 W_F^<-0.26>V_L^<-0.62>N^<-0.19>V_W^<-0.25>.
社団法人日本生物工学会の論文
1987-06-25