Analytical expressions of specific heat capacities for aqueous solutions of CMC and CPE

Semmar, Nadjib; Tanguier, J.L.; Rigo, M. O.

doi:10.1016/j.tca.2004.01.030

Cited by 6 publications

(6 citation statements)

References 8 publications

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“…The physical properties of the non-Newtonian solutions, except the rheological properties, were taken as identical to those of pure water (Pinho and Coelho [22], Rohsenow et al [23] and Semmar et al [24]). …”

Section: Characterization Of the Fluidsmentioning

confidence: 99%

Heat transfer coefficients from Newtonian and non-Newtonian fluids flowing in laminar regime in a helical coil

Pimenta

Campos

2013

International Journal of Heat and Mass Transfer

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A B S T R A C TThis study aimed to carry out experimental work to obtain, for Newtonian and non-Newtonian fluids, heat transfer coefficients, at constant wall temperature as boundary condition, in fully developed laminar flow inside a helical coil. The Newtonian fluids studied were aqueous solutions of glycerol, 25%, 36%, 43%, 59% and 78% (w/w) and the non-Newtonian fluids aqueous solutions of carboxymethylcellulose (CMC), a polymer, with concentrations 0.1%, 0.2%, 0.3%, 0.4% and 0.6% (w/w) and aqueous solutions of xanthan gum (XG), another polymer, with concentrations 0.1% and 0.2% (w/w). According to the rheological study performed, the polymer solutions had shear thinning behavior and different values of elasticity. The heli-cal coil used has internal diameter, curvature ratio, length and pitch, respectively: 0.004575 m, 0.0263, 5.0 m and 11.34 mm. The Nusselt numbers for the CMC solutions are, on average, slightly higher than those for Newtonian fluids, for identical Prandtl and generalized Dean numbers. As outcome, the viscous component of the shear thinning polymer tends to potentiate the mixing effect of the Dean cells. The Nusselt numbers of the XG solutions are significant lower than those of the Newtonian solutions, for identical Prandtl and generalized Dean numbers. Therefore, the elastic component of the polymer tends to diminish the mixing effect of the Dean cells. A global correlation, for Nusselt number as a function of Péclet, generalized Dean and Weissenberg numbers for all Newtonian and non-Newtonian solutions studied, is presented.K e y w o r d s

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Section: Characterization Of the Fluidsmentioning

confidence: 99%

Heat transfer coefficients from Newtonian and non-Newtonian fluids flowing in laminar regime in a helical coil

Pimenta

Campos

2013

International Journal of Heat and Mass Transfer

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“…Bellet (1975) and Raynaud (1985) narrated that the specific heat values of solutions are higher than the specific heat of water [33][34]. Water cannot be regarded as equal to that of pure water [29]. Even if water has the highest specific heat of all liquids except ammonia, in the presence of water molecules, molecular chains of xanthan gum possess an energy potential which increases with temperature and concentration, thus it has a high specific heat compared to water.…”

Section: Experimental Values Of Specific Xanthan Gum Solution Tothe Smentioning

confidence: 99%

“…The experimental data of specific heat of xanthan gum was also tested using second order polynomial model equation Table 2 shows the comparison of experimental results and specific heat of xanthan gum solution estimated using the model equation proposed by Semmar et al, (2004).…”

Section: Model Equation Of Semmar Et Al (2004)mentioning

confidence: 99%

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Measurement and Model Validation of Specific Heat of Xanthan Gum Using Joules Calorimeter Method

Muthamizhi¹

2013

IJRET

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“…The values of the physical properties of the glycerol solutions were obtained through literature and the determination of the viscosity was done in a rotational viscometer. The physical properties of the non-Newtonian solutions, except the rheological properties, were taken as identical to those of pure water [20][21][22].…”

Section: Characterization Of the Fluidsmentioning

confidence: 99%

Friction losses of Newtonian and non-Newtonian fluids flowing in laminar regime in a helical coil

Pimenta¹,

Campos

2012

Experimental Thermal and Fluid Science

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a b s t r a c tThis study aimed to carry out experimental work to determine, for Newtonian and non-Newtonian fluids, the friction factor (f c ) with simultaneous heat transfer, at constant wall temperature as boundary condition, in fully developed laminar flow inside a vertical helical coil. The Newtonian fluids studied were aqueous solutions of glycerol, 25%, 36%, 43%, 59% and 78% (w/w). The non-Newtonian fluids were aqueous solutions of carboxymethylcellulose (CMC), a polymer, with concentrations of 0.2%, 0.3%, 0.4% and 0.6% (w/w) and aqueous solutions of xanthan gum (XG), another polymer, with concentrations of 0.1% and 0.2% (w/w). According to the rheological study done, the polymer solutions had shear-thinning behavior and different values of viscoelasticity. The helical coil used has an internal diameter, curvature ratio, length and pitch, respectively: 0.00483 m, 0.0263, 5.0 m and 11.34 mm. It was concluded that the friction factors, with simultaneous heat transfer, for Newtonian fluids can be calculated using expressions from literature for isothermal flows. The friction factors for CMC and XG solutions are similar to those for Newtonian fluids when the Dean number, based in a generalized Reynolds number, is less than 80. For Dean numbers higher than 80, the friction factors of the CMC solutions are lower those of the XG solutions and of the Newtonian fluids. In this range the friction factors decrease with the increase of the viscometric component of the solution and increase for increasing elastic component. The change of behavior at Dean number 80, for Newtonian and non-Newtonian fluids, is in accordance with the study of Ali [4]. There is a change of behavior at Dean number 80, for Newtonian and non-Newtonian fluids, which is in according to previous studies. The data also showed that the use of the bulk temperature or of the film temperature to calculate the physical properties of the fluid has a residual effect in the friction factor values.

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Analytical expressions of specific heat capacities for aqueous solutions of CMC and CPE

Cited by 6 publications

References 8 publications

Heat transfer coefficients from Newtonian and non-Newtonian fluids flowing in laminar regime in a helical coil

Heat transfer coefficients from Newtonian and non-Newtonian fluids flowing in laminar regime in a helical coil

Measurement and Model Validation of Specific Heat of Xanthan Gum Using Joules Calorimeter Method

Friction losses of Newtonian and non-Newtonian fluids flowing in laminar regime in a helical coil

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