Browsing by Subject "Chemical Engineering Department"

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Measurement of the Thermal Conductivity of Powders by Two Different Methods
(1993) Sih, Samuel S.; Barlow, Joel W.
The thermal diffusivities and thermal conductivities of powders, especially PMMA-coated silicon carbide, at various temperatures, have been tested by two different dynamic methods, the water-bath method and the laser-heated method. The thermal conductivity data found by these two techniques are found to be consistent with each other.
The Measurement of the Thermal Properties and Absorptances of Powders Near their Melting Temperatures
(1991) Sih, Samuel S.; Barlow, Joel W.
A new technique, using a laser as the heating source, has been adopted to measure the heat capacities, thermal diffusivities, thermal conductivities, and absorptances of powders (especially polymer powders) near their melting temperatures. This makes use of an unsteady state process. The data of the thermal conductivities obtained through this technique below 100°C are in concord with the values obtained through the other techniques, which predicts well for the use of this technique for still higher temperatures, up to the melting temperatures of the powders to be investigated.
Models for the Prediction of the Thermal
(1991) Xue, Samuel S.; Barlow, Joel W.
Five models and eq\1ationsJorthe.predictic;>nof the tbertnal conduc~"ities of powders in the literature are compared with the data obtainedill the experiments of the authors. Anew modified ntodel for the. correlation of the experimental data is presented. Key words: differential scanning calorimetry, porosity, solid content, specific heat, thermal conductivity.
Solid Freeform Fabrication An Advanced Manufacturing Approach
(1990) Bourell, D.L.; Beaman, J.J.; Marcus, H.L.; Barlow, J.W.; Bourell, D.L.; Beaman, J.J.; Marcus, H.L.; Barlow, J.W.
Thermal Properties of Powders
(1990) Xue, Samuel; Barlow, J.W.
This paper presents measurements of the specific heats of various powders, including nylon, ABS, PVC, and two kinds of wax. An unsteady-state conduction technique is also presented for measuring the thermal conductivities of these powders at temperatures below those where sintering occurs. Both specific heats and thermal conductivities are found to be functions of temperature.