SIMPLE VISCOSITYMEASUREMENT OF LIQUID BY NATURAL CONVECTION MEASUREMENT OF LOW VISCOSITY SILICONE OIL BY REDUCING THERMAL PLUME EFFECT)
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Accession number;07A0043237
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| Title;SIMPLE VISCOSITYMEASUREMENT OF LIQUID BY NATURAL CONVECTION MEASUREMENT OF LOW VISCOSITY SILICONE OIL BY REDUCING THERMAL PLUME EFFECT) |
| Author;
TANAKA HIROSHI
(Fukukodai)
OKAWAUCHI YOSHIHIKO
(Fukukodai)
TOMIMURA TOSHIO
(Inst. Materials Chemistry and Engineering, Kyusyu Univ., JPN)
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Journal Title;Thermophys Prop
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Journal Code:X0031A
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ISSN:0911-1743
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VOL.27th;NO.;PAGE.104-106(2006)
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| Figure&Table&Reference;FIG.7, REF.6 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;For the purpose of developing a practical measurement method of thermal conductivity and viscosity of liquids, the authors have proposed a simple method using natural convection around a uniformly heated vertical plate. Based on the method, those physical properties can be evaluated by mean plate temperature measured by a thermocouple and shear force measurement by a digital electric balance. To verify the validity of the present method, a series of experiments have been performed so far for six kinds of silicone oil, and fairly good results have been obtained for the kinematic viscosity v of 10, 100 and 1000mm'2'/s. However, concerning the lower kinematic viscosity v of 1, 2 and 5mm'2'/s, measured values were about two times higher than those put on a catalogue. To investigate the cause, two kinds of measuring vessels of Type-1 and Type-2 were prepared in the present study (see Figures 4 and 6), which were designed to reduce the thermal plume effect. Measured results using the vessels Type-1 and Type-2 for the kinematic viscosity v of 1mm'2'/s are shown in Figures 5 and 7, respectively, together with the results evaluated by Equation (2) into which the measured mean plate temperature and the ambient liquid temperature are substituted. As a result, the effect of the thermal plume has been reduced almost by half. However, a few corrections are necessary to make at low viscosity. (author abst.) |
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