Influence of flow regime and thermal power on residence time distribution in tubular Joule Effect Heaters

Residence time distribution in holding tubes using generalized convection model and numerical convolution for non-ideal tracer detection

“…7, the signal distortion caused by the detection system is clear. Fillaudeau et al (2009) verified that the distortion of the inlet signal can be neglected if it does not exceed 1% of the mean residence time. In this work the mean residence time of the detection cell exceeds in more than 22% the mean residence time of T1 and 9% the mean residence time of T2.…”

“…Such models are very useful for diagnostic purposes and to detect faulty flow (Levenspiel and Bischoff, 1963;Levenspiel, 1999). Fillaudeau et al (2009) successfully used a series association of one PFR and two CSTRs to represent the flow through a tubular Joule effect heater used for food heat treatment. In the present work, a series association of one PFR and one CSTR is considered.…”

“…The internal volume and shape of the injection and detection systems can distort the tracer signal, compromising the RTD results (Mills and Dudukovic, 1989). When it is not possible to produce an instantaneous pulse signal at the entrance of the process, a supplementary detection system has to be placed at the entrance of the process to record the input signal (Chakrabandhu and Singh, 2006;Fillaudeau et al, 2009). Fig.…”

Influence of whey protein aggregation on the residence time distribution in a tubular heat exchanger and a helical holding tube during heat treatment process

“…There are well-known non-ideal models as the axial dispersion model and the tank-in-series model which are applied for small deviation from plug flow. One have compartment models considering simple models in series or in parallel, associated to dead zone and bypass or recycle flows (Wen and Fan, 1975;Levenspiel, 1999;Fillaudeau et al, 2009). More complex models can be derived by solving the hydrodynamic and mass balance equations (Nauman and Nigam, 2004;Zhang et al, 2005) or by semi-empirical methods (Ham and Platzer, 2004;Adeosun and Lawal, 2009).…”

Modelagem matemática e validação experimental da pasteurização de alimentos líquidos em trocadores de calor a placas.

“…Há um atraso ligado ao escoamento dentro da célula e um achatamento da curva, associado às recirculação interna do fluido. Fillaudeau et al (2009) ) para ajuste dos modelos de DTR aos dados coletados com os tubos de retenção T1 e T2 (Gutierrez et al, 2010).…”