Variable volume piezometer for measurement of volumetric properties of materials under high pressure |
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Authors: | Stephen Min V. M. Balasubramaniam |
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Affiliation: | 1. Battelle Memorial Institute , 505 King Ave, Columbus, OH, 43201, USA;2. Department of Food Science and Technology , The Ohio State University , 2015 Fyffe Court, Columbus, OH, 43210, USA |
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Abstract: | A piezometer was designed to measure volume change of foods and other biomaterials as a function of pressure, and calibrated and tested up to 700 MPa at 25°C. The sensor was constructed from a polycarbonate tube, sealed with a plug on one end and a removable piston on the other. Samples were placed inside the tube. Upon pressurization, the piston displaced inside the tube, transmitting pressure to the sample; impedance in a magnet wire coil on the outside of the tube was measured to characterize volume change. Sensor calibration with water yielded a polynomial that characterized volume as a function of impedance. Sensor precision is 0.3% of measured volume; its resolution allows measurement of sub-microliter volume changes. Testing with ethanol and sucrose solutions yielded data within 1% of previously reported values. The sensor's applications include measurement of volumetric properties of liquid and solid biomaterials, and chemical reaction volumes. |
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Keywords: | density compressibility piezometer volume |
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