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PARAMETERS AFFECTING THE ACCURACY OF TEMPERATURE MEASUREMENTS DURING HIGH HYDROSTATIC PRESSURE PROCESSING
Author(s) -
KHURANA MEENAKSHI,
KARWE MUKUND V.
Publication year - 2013
Publication title -
journal of food process engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.507
H-Index - 45
eISSN - 1745-4530
pISSN - 0145-8876
DOI - 10.1111/j.1745-4530.2011.00652.x
Subject(s) - thermocouple , cabin pressurization , lag , temperature measurement , hydrostatic equilibrium , hydrostatic pressure , mechanics , thermodynamics , process (computing) , time lag , thermal , materials science , computer science , composite material , physics , computer network , quantum mechanics , operating system
Theoretical analysis of the temperature response of a thermocouple assembly during high hydrostatic pressure processing (HHPP) was carried out to estimate the lag in the temperature measurement. The analysis was carried out for temperature variation during the pressurization, pressure hold and pressure release steps of HHPP. The estimated temperature lag was used to quantify the temperature discrepancy between the measured and the actual temperatures. The solution obtained showed that there could be a lag of approximately 2 K depending on the design of the temperature‐measuring device. Equations governing the thermocouple response were nondimensionalized to obtain the parameters that govern the lag in temperature during the HHPP. PRACTICAL APPLICATIONS The results obtained from the theoretical analysis presented are relevant and important in evaluating a high‐pressure, high‐temperature process. In particular, the method presented allows estimation of inaccuracies of temperature measurement in a high‐pressure vessel and its impact on the thermal process calculations ( F value).