Ein instätionares verfahren zur messung der wärmeleitfähigkeit von flüssigkeiten und gasen

Graßmann, P.; Straumann, W.

doi:10.1016/0017-9310(60)90008-9

Cited by 22 publications

(11 citation statements)

References 4 publications

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“…The divalent salt is the normally stable state for the former four lanthanides. It has been reported by Hastie et al (7), that EuClg and LuClg, for example, would be stabilized only by mixing these lanthanide salts with KC1.…”

mentioning

confidence: 96%

Liquid thermal conductivities of organic compounds and petroleum fractions

Mallan¹,

Michaelian²,

Lockhart³

1972

J. Chem. Eng. Data

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Liquid thermal conductivities of 29 organic compounds and 15 petroleum fractions have been measured in a transient, relative apparatus of the hot wire type between 20°and 120°C at a pressure of 7.5 atm.Liquid thermal conductivity is a physical property difficult to measure accurately. Natural convection caused by the imposed temperature difference tends to make experimental values too high. It is known now that many data in reference books and handbooks are in error on the high side by 20% or more.Of all organic compounds, toluene has been the one studied most for thermal conductivity.

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mentioning

confidence: 96%

Liquid thermal conductivities of organic compounds and petroleum fractions

Mallan¹,

Michaelian²,

Lockhart³

1972

J. Chem. Eng. Data

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“…More instruments were developed; Grassman and Straumann [30] in 1960 published a transient hot-wire instrument for gases and solids, and Haupin [31], an instrument for solids in which a thermocouple [32] with its junction placed in the middle of the sample is heated with alternating current acting both as a heat source and thermometer.…”

Section: Period From 1888 To 1971mentioning

confidence: 99%

Historical Evolution of the Transient Hot-Wire Technique

2010

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The paper attempts to describe the historical evolution of the transient hot-wire technique, employed today for the measurement of the thermal conductivity of fluids and solids over a wide range of conditions. Starting from the first experiments with heated wires in 1780 during the discussions of whether gases could conduct heat, it guides the reader through typical designs of cells and bridges, software employed and theory developed, to the modern applications. The paper is concluded with a discussion of the areas of application where problems still exist, and a glimpse of the technique's future.

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“…In jiingster Zeit sind Arbeiten mit instation~ren Drahtverfahren yon GILLA3~ und LAM3I [ii], KELE-_~IEN [12] sowie yon GI~ASSMANN und STRAUMANN [13] bekannt geworden. Die mathematisehen Grundlagen far diese Verfahren wurden yon PFRIE~ sowie EUCKEN und ENGLEt~T weiterentwiekelt.…”

Section: Einfiihrungunclassified

Instationäre Messung der Wärmeleitfähigkeit mit optischer Registrierung

Bach

Grigull

1970

Wärme- und Stoffübertragung

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Zusammenfassung. Die W~irmeleitf~thigkeit yon Wasserwird im Temperaturbereich yon 20 bis 90 ~ mad bei 1 bar mit einem neuen instation/~ren Absolutverfahren bestimmt. Zur Aufzeichnung des instation~ren Feldes des Brechungsindex und der Temporatur werden zwei interferomotrische Anordnungen benutzt: Die Methode yon MACI~-Z~NDER mud das Biprismaverfahren. :Die Ergebnisse stehen in guter ~bereinstimmung zu den Messungen anderer Autoren, die station~re Methoden beuutzten. Die Unsicherheit der 374 Einzelmessungen wird auf hSchstens :~ 1% geseh/~tzt. Damit ist nachgewiesen, dal~ ein instation~res MeBverfahren mit optischer l~egistrierung mit den klassischen station~ren Verfahren hinsichtlieh der Mei~unsieherheit konkurrieren kann. Das instation/~re Verfahren kommt ohne kalorische Messungen aus und besteht bei optischer Registrierung im wesentlichen aus L/~ngenmessungen. Abstract.The thermal conductivity of water in the temperature region from 20 to 90 ~ and at 1 bar was measured by means of a new uasteady-state absolute method. To record the unsteady-state field of the index of refraction and of the temperature, two interferometrie arrangements were used: The MACIt-ZEttNDER and the biprisma methods. The results are in good agreement with measurements of other authors, who had used steady-state methods. The maximum degree of uncertainty of the 374 measurements is estimated to be • 1%. Thus it is shown that unsteady-state methods with optical recording can well be compared with classical steady-state methods regarding uncertainties. The method does not roquire calorie measurements and uses primarly determinations of lengths.

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Ein instätionares verfahren zur messung der wärmeleitfähigkeit von flüssigkeiten und gasen

Cited by 22 publications

References 4 publications

Liquid thermal conductivities of organic compounds and petroleum fractions

Liquid thermal conductivities of organic compounds and petroleum fractions

Historical Evolution of the Transient Hot-Wire Technique

Instationäre Messung der Wärmeleitfähigkeit mit optischer Registrierung

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