Melting Point and Natural Convective Heat Transfer Coefficient of Paraffin Wax

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อาจารีย์ ทองอ่อน
เพ็ญศรี ประมุขกุล
วิไลพร ลักษมีวาณิชย์


This research was aimed to study melting behavior of paraffin wax and to evaluate the natural heat convection coefficient of solid cylinder paraffin wax.  Two grades of white commercial grade and yellow market grade of solid paraffin wax were studied.   Three sizes of flat test tube having diameter of 1.5, 2.0 and 2.5 centimeters were used.  Three different amount of paraffin, indicated from sample heights of 5, 7 and 10 centimeters, were set.   The results found the melting point of the unknown amount of carbon atom–paraffin ranged from 44 to 77 Celsius.  Based on the numerical analysis, cooling data of solid cylinder paraffin from around 50 Celsius to room temperature of about 30 Celsius were used for natural convection coefficients evaluation, which was found to be ranged from 3 to 9 W/m2 oC.  Mass independent properties were found on both melting point and natural convection coefficient.


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บทความวิจัย (Research Articles)