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Application of Ultrasonic Methods for Evaluation of High-Pressure Physicochemical Parameters of Liquids

Kiełczyński Piotr, Ptasznik Stanisław, Szalewski Marek, Balcerzak Andrzej, Wieja Krzysztof, Rostocki Aleksander J.

Archives of Acoustics

2019

Vol. 44, No. 2

329--337

An emerging ultrasonic technology aims to control high-pressure industrial processes that use liquids at pressures up to 800 MPa. To control these processes it is necessary to know precisely physicochemical properties of the processed liquid (e.g., Camelina sativa oil) in the high-pressure range. In recent years, Camelina sativa oil gained a significant interest in food and biofuel industries. Unfortunately, only a very few data characterizing the high-pressure behavior of Camelina sativa oil is available. The aim of this paper is to investigate high pressure physicochemical properties of liquids on the example of Camelina sativa oil, using efficient ultrasonic techniques, i.e., speed of sound measurements supported by paralel measurements of density. It is worth noting that conventional low-pressure methods of measuring physicochemical properties of liquids fail at high pressures. The time of flight (TOF) between the two selected ultrasonic impulses was evaluated with a cross-correlation method. TOF measurements enabled for determination of the speed of sound with very high precision (of the order of picoseconds). Ultrasonic velocity and density measurements were performed for pressures 0.1-660 MPa, and temperatures 3-30°C. Isotherms of acoustic impedance Za, surface tension σ and thermal conductivity k were subsequently evaluated. These physicochemical parameters of Camelina sativa oil are mainly influenced by changes in the pressure p, i.e., they increase about two times when the pressure increases from atmospheric pressure (0.1 MPa) to 660 MPa at 30°C. The results obtained in this study are novel and can be applied in food, and chemical industries.

Zastosowanie metod ultradźwiękowych w procesie regeneracji części maszyn

Wilczarska J.

Inżynieria i Aparatura Chemiczna

2014

Nr 2

125--126

Wzrost zainteresowania badaniami ultradźwiękowymi wynika z ich nieniszczącego charakteru, który zapewnia ocenę trwałości elementów maszyn podczas działania obciążeń, identyfikację przydatności technologicznej i eksploatacyjnej materiału oraz ocenę niezawodności i bezpieczeństwa maszyny, nie ingerując znacząco w jego strukturę i właściwości użytkowe. W pracy przedstawiono metody badań ultradźwiękowych oraz aparaturę badawczą wykorzystywaną do tych badań. Szczególną uwagę zwrócono na możliwości cyfrowego ultradźwiękowego defektoskopu CUD.

Increased interest in ultrasonic inspection methods providing the assessment of machine elements' stability during load operation, identification of material performance and technological suitability, and finally machine reliability and safety assessment, without interfering significantly into their structure and properties, is caused by non-destructive nature of these methods. A method of ultrasonic testing and research equipment used for these studies are presented in the paper. Particular attention is drawn to possibilities and characteristics of the digital ultrasonic flaw detector CUD.