Line source method

An advantage over the line source method and other parameter estimation techniques is that the estimate can be made directly on the measured return temperature. Using the derived average heat extraction or injection rate may... 

With the exception of the last calibration run (calibrating the parameters in series) all ground thermal conductivity and borehole conductivity values are very comparable. The ground thermal conductivity values estimated are significantly lower than the estimates obtained with the line source method (on the first 40 h of data). When the parameters are estimated separately, estimated ground thermal conductivity is higher. 

Lobo, H. and Cohen, C., Measurement of Thermal Conductivity of Polymer Melts by the Line-Source Method, Polym. Eng. Set, 30, 65 (1990)... 

Zinc in atomic absorption spectroscopy is remarkably free from interferences as contrasted to the difiiculties encountered in polarography or with colorimetric methods (M4). Gidley and Jones (G4, G5) studied the influence of 27 elements and the only effect seen was a depression with silicon. The absorption enhancement encountered by these authors with haloid acids could be traced back to the attack of the brass burner by the samples and to the use of a brass hollow cathode tube as zinc line source. Methods for the determination of zinc in various metals and alloys are described by these authors. 

Na O -h SiO. Susa et al —- (line source method) reported thermal conductivity data for solid and liquid slags for three compositions the single value obtained by Ogino et al l3 (radial heat-flow method) is in reasonable agreement with these data. 

The most common transient technique that gives thermal conductivity directly is the continuous line source method. For a line source heater of infinite length in an infinite mass of sample material, the temperature at a distance / from the line source is given bv [31]... 

More recently, sensitivity quite comparable to that afforded by the line source method has been obtained by timed flash photographic spectroscopy, by which the rate of appearance of OH in the shock-wave decomposition of HgO vapour was reinvestigated. Values of A over the instrumental slit function, averaged for several lines, are included in Fig. 2.3. 

THERMAL CONDUCTIVITY. SUMMARY OF THE LINE-SOURCE METHOD AND THEORY OF HETEROGENEOUS MIXTURES. SUMMARY REPT. NO. 10 JULY-SEPT. 1964. 

D5930-97 Standard Test Method for Thermal Conductivity of Plastics by Means of a Transient Line-Source Method... 

The plane-source method was originally applied to the measurement of refractory building materials (24), as was the line-source method. However, the plane source method has been applied with success, at least in one instance, to pol3Tneric systems (4), and its use will probably increase in the future. 

Lobo H, Cohen C. Measurement of thermal conductivity of polymer melts by the line-source method. Polym Eng Sci 1990 30(2) 65-70. 

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