Plug flow of yoghurt in piping as determined by cross-correlated dual-plane electrical resistance tomography

Cross-correlation of electrical resistance tomography (ERT) was used to determine the velocity profile of yoghurt in a pipe of industrial dimensions. In viscometry, at shear rates higher than 10 s(-1), the yoghurt followed the power law model with a K-value of 3.7 Pa s(n) and an n-value of 0.37. In pipe flow, however, within the tested mean velocity range of 0.05-0.25 m s(-1), the yoghurt appeared to flow as a plug. The local velocity was constant from the centreline to within 3 mm of the tube wall, which corresponds to the resolution of the ERT method. (c) 2005 Elsevier Ltd. All rights reserved.

[2]  Mi Wang,et al.  Electrical resistance tomography for process applications , 1996 .

[3]  Khalid Aziz,et al.  The Flow Of Complex Mixtures In Pipes , 2021 .

[4]  Dominik Sankowski,et al.  The 'best-correlated pixels' method for solid mass flow measurements using electrical capacitance tomography , 2002 .

[5]  Mi Wang,et al.  Inverse solutions for electrical impedance tomography based on conjugate gradients methods , 2002 .

[6]  Yasushi Takeda,et al.  Velocity profile measurement by ultrasonic doppler method , 1993 .

[7]  W. Merzkirch,et al.  PIV measurements of the time-averaged flow velocity downstream of flow conditioners in a pipeline , 1996 .

[8]  Francis Butler,et al.  Time-dependent viscosity of stirred yogurt. Part II: tube flow , 2002 .

[9]  Luís F. Melo,et al.  Heat transfer and rheology of stirred yoghurt during cooling in plate heat exchangers , 2003 .

[10]  J. Bimbenet,et al.  Flow properties of stirred yogurt: Calculation of the pressure drop for a thixotropic fluid , 1998 .

[11]  K. McCarthy,et al.  Rheology of yogurt during pipe flow as characterized by magnetic resonance imaging , 2002 .

[12]  James Freeman Steffe,et al.  Rheological Methods in Food Process Engineering , 1992 .

[13]  Feng Dong,et al.  The design of a dual-plane ERT system for cross correlation measurement of bubbly gas/liquid pipe flow , 2001 .

[14]  Roger T. Bonnecaze,et al.  Measurement of angular velocities using electrical impedance tomography , 1998 .

[15]  S. Pricl,et al.  Rheological behaviour of low-fat and full-fat stirred yoghurt , 1995 .

[16]  F. J. Dickin,et al.  Imaging stirred‐vessel macromixing using electrical resistance tomography , 1998 .

[17]  Gary Lucas,et al.  Measurement of the solids volume fraction and velocity distributions in solids–liquid flows using dual-plane electrical resistance tomography , 1999 .

[18]  M. Escudier,et al.  Pipe flow of a thixotropic liquid , 1996 .

[19]  A. Magnin,et al.  Cone-and-plate rheometry of yield stress fluids. Study of an aqueous gel , 1990 .