Non‐Newtonian Heat Transfer on a Plate Heat Exchanger with Generalized Configurations

Carezzato, Alessandra; Alcântara, Maria Regina; Telis‐Romero, Javier; Tadini, Carmen C.; Gut, Jorge Andrey Wilhelms

doi:10.1002/ceat.200600294

Cited by 34 publications

(15 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The study of non-Newtonian flow in plate heat exchangers (PHEs) is of great importance for the food industry, since various processes include this device, such as cooling and heating applications in milk, citrus juices and tropical fruit pulp pasteurization and concentration processes (Leuliet et al, 1987;Carezzato et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Non-newtonian flow and pressure drop of pineapple juice in a plate heat exchanger

Cabral

Gut

Telis

et al. 2010

Braz. J. Chem. Eng.

Self Cite

View full text Add to dashboard Cite

-The study of non-Newtonian flow in plate heat exchangers (PHEs) is of great importance for the food industry. The objective of this work was to study the pressure drop of pineapple juice in a PHE with 50º chevron plates. Density and flow properties of pineapple juice were determined and correlated with temperature (17.4 ≤ T ≤ 85.8°C) and soluble solids content (11.0 ≤ X s ≤ 52.4 ºBrix). The Ostwald-de Waele (power law) model described well the rheological behavior. The friction factor for non-isothermal flow of pineapple juice in the PHE was obtained for diagonal and parallel/side flow. Experimental results were well correlated with the generalized Reynolds number (20 ≤ Re g ≤ 1230) and were compared with predictions from equations from the literature. The mean absolute error for pressure drop prediction was 4% for the diagonal plate and 10% for the parallel plate.

show abstract

Section: Introductionmentioning

confidence: 99%

Non-newtonian flow and pressure drop of pineapple juice in a plate heat exchanger

Cabral

Gut

Telis

et al. 2010

Braz. J. Chem. Eng.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Tested fluids were a 80/20(w/w) glycerin/water mixture (Newtonian) and a 1.0%(w/w) solution of carboxymethylcellulose (CMC), which is pseudoplastic (Dantas et al, 2014). Generalized Reynolds number for power law fluids in tubes was calculated according to Carezzato et al (2007). Physical properties of fluids were calculated at average temperature (Dantas et al, 2014).…”

Section: Methodsmentioning

confidence: 99%

Effective Radial Diffusivities to Model Enhanced Mass and Heat Transfer in Laminar Flow Reactors

Dantas¹,

Morais²,

Gut³

2015

Anais Do XX Congresso Brasileiro De Engenharia Química

View full text Add to dashboard Cite

-Main features of a laminar flow reactor (LFR) are streamline flow and parabolic velocity profile. Consequently, heating and cooling are difficult and there is a large spread in the residence time distribution (RTD). Enhanced heat and mass transfer can be found in coils or corrugated tubes or in the presence of wall roughness, curves, pipe fittings or mechanical vibration. Modeling these cases can be complex because of the induced secondary flow. Objective of this work is to introduce this enhanced transport in the LFR model by means of effective radial diffusivities of heat and mass. Model validation experiments were conducted in a LFR with high wall relative roughness and curves. RTD experiments were compared with model simulations of tracer dispersion to obtain the mass diffusivity. Heat transfer experiments provided the effective thermal diffusivity. Tested fluids were a glycerin/water mixture (Newtonian) and a CMC solution (pseudoplastic). Model was successfully adjusted and parameters were correlated with Reynolds number for flow.

show abstract

“…where K is the consistency coefficient of the powerlaw model, D eq is the equivalent diameter of the duct and ξ and υ are geometrical parameters of the duct (D eq = 2 R, ξ = 8 and υ = 3 for a circular tube) (Delplace and Leuliet, 1995;Carezzato et al, 2007). Thermo-physical properties of water were evaluated using the correlations compiled by Gut and Pinto (2003).…”

Section: And (19)mentioning

confidence: 99%

“…Viscosity of the glycerin/water mixture was obtained from Cheng (2008). Properties of the CMC solution were determined by this research group and are available elsewhere (Carezzato et al, 2007). All properties were evaluated at inlet and outlet conditions and the average was used in the calculations.…”

Section: And (19)mentioning

confidence: 99%

Determination of the Effective Radial Thermal Diffusivity for Evaluating Enhanced Heat Transfer in Tubes Under Non-Newtonian Laminar Flow

Morais

Gut

2015

Braz. J. Chem. Eng.

View full text Add to dashboard Cite

-Enhanced heat transfer in tubes under laminar flow conditions can be found in coils or corrugated tubes or in the presence of high wall relative roughness, curves, pipe fittings or mechanical vibration. Modeling these cases can be complex because of the induced secondary flow. A modification of the Graetz problem for non-Newtonian power-law flow is proposed to take into account the augmented heat transfer by the introduction of an effective radial thermal diffusivity. The induced mixing was modeled as an increased radial heat transfer in a straight tube. Three experiments using a coiled tube and a tubular heat exchanger with high relative wall roughness are presented in order to show how this parameter can be obtained. Results were successfully correlated with Reynolds number. This approach can be useful for modeling laminar flow reactors (LFR) and tubular heat exchangers available in the chemical and food industries.

show abstract

Non‐Newtonian Heat Transfer on a Plate Heat Exchanger with Generalized Configurations

Cited by 34 publications

References 13 publications

Non-newtonian flow and pressure drop of pineapple juice in a plate heat exchanger

Non-newtonian flow and pressure drop of pineapple juice in a plate heat exchanger

Effective Radial Diffusivities to Model Enhanced Mass and Heat Transfer in Laminar Flow Reactors

Determination of the Effective Radial Thermal Diffusivity for Evaluating Enhanced Heat Transfer in Tubes Under Non-Newtonian Laminar Flow

Contact Info

Product

Resources

About