Dynamics of shell‐and‐tube heat exchangers to arbitrary temperature and step flow variations

Xuan, Ying; Roetzel, Wilfried

doi:10.1002/aic.690390305

Cited by 25 publications

(9 citation statements)

References 9 publications

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“…A method was developed by Xuan and Roetzel [32] for predicting dynamic performances of parallel and counterflow heat exchangers subject to arbitrary temperature variations and step flow disturbances. The study included the effect of flow maldistribution and the influence of heat capacities of both fluids.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of flow maldistribution in air-cooled heat exchangers

et al. 2009

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Section: Introductionmentioning

confidence: 99%

Evaluation of flow maldistribution in air-cooled heat exchangers

et al. 2009

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“…• Various transients such as response to step changes in flow or temperature o Tan and Spinner [8] o Yin and Jensen [9] o Luo et al [10] o Romie [11][12][13] o Sharifi et al [14] o Xuan and Roetzel [28,29] • Arbitrary temperature disturbances o Luo et al [10] o Xuan and Roetzel [28,29] o Lakshmanan and Potter [15] o Roetzel and Xuan [16] • Simultaneous variation of flow and temperature o Abdelghani-Idrissi et al [7] • Frequency response of sinusoidal temperature inputs o Lakshmanan and Potter [15] • Mal-distribution of flow o Sahoo and Roetzel [27] o Xuan and Roetzel [29] Skoglund, Årzén & Dejmek, p. 6 of 24…”

Section: Introductionmentioning

confidence: 99%

“…• Axial heat dispersion o Sahoo and Roetzel [27] o Xuan and Roetzel [28,29] o Roetzel and. Das [30] o Roetzel and Balzereit [31] • Comparison of model results with experimental measurements o Abdelghani-Idrissi et al [7] o Sharifi et al [14] o Xuan and Roetzel [28] o Roetzel and Balzereit [31] o Kauhanen [17] • Fluid dispersion, invetsigating axial dispersion and mal-distribution of flow o Sahoo and Roetzel [27] o Xuan and Roetzel [28,29] o Roetzel and.…”

Section: Introductionmentioning

confidence: 99%

“…Das [30] o Roetzel and Balzereit [31] • Comparison of model results with experimental measurements o Abdelghani-Idrissi et al [7] o Sharifi et al [14] o Xuan and Roetzel [28] o Roetzel and Balzereit [31] o Kauhanen [17] • Fluid dispersion, invetsigating axial dispersion and mal-distribution of flow o Sahoo and Roetzel [27] o Xuan and Roetzel [28,29] o Roetzel and. Das [30] o Roetzel and Balzereit [31] • Object-oriented dynamic modelling tools o Mattsson et al [18] o Åström et al [19] o Elmqvist et al [20] o Tummescheit [21] o Wozny et al [22] • The modelling tool Modelica [3] o Åström et al [19] o Wozny et al [22] o Tiller [23] o Mattsson et al [24] o Eborn [25] o Casella and Schiavo [26] o Skoglund [1] and [2] A good coverage of the field of heat-exchanger dynamics is also given by Roetzel and Xuan [36].…”

Section: Introductionmentioning

confidence: 99%

“…Sahoo and Roetzel [27], Xuan and Roetzel [28,29], Roetzel and Das [30] and Roetzel and Balzereit [31] to investigate both axial dispersion and maldistribution of flow. This paper describes how dynamic models can be constructed in a modern modelling language to simulate fluid composition transitions in a heat exchanger, events that are common in the liquid food industry and therefore important to understand.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic object-oriented heat exchanger models for simulation of fluid property transitions

Skoglund

Årzén

2006

International Journal of Heat and Mass Transfer

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Object-oriented heat-exchanger models were developed to simulate the dynamic thermal effects of dynamic changes in fluid composition and thus of fluid properties in a type of liquid typical for food products. The models were written in the object-oriented language Modelica as objects in a library structure being developed to simulate complex liquid food process lines and their control systems. The models were based on moderate discretization of the heat exchanger into control volumes, and the fluid dispersion was modelled either as ideal mixing or as transport delay in each control volume. The transport delay model exhibited the best computational performance as well as affording flexibility in fluid dispersion modelling. KeywordsAxial spatial coordinate (along the fluid channel), m or exponent in Equation (2) y Spatial coordinate perpendicular to x and z, m or exponent in Equation (2) z Vertical spatial coordinate, m or exponent in Equation (2) Greek lettersDispersive thermal conductivity due to flow dispersion defined by

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Correlations of flow maldistribution parameters in an air cooled heat exchanger

Habib¹,

Ben‐Mansour²,

Said³

et al. 2007

Numerical Methods in Fluids

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SUMMARYThe present paper provides correlations of flow maldistribution parameters in air-cooled heat exchangers. The flow field in the inlet header was obtained through the numerical solution of the governing partial differential equations including the conservation equations of mass and momentum in addition to the equations of the turbulence model. The results were obtained for different number of nozzles of 2-4, different inlet flow velocities of 1-2.5 m/s and different nozzle geometries in addition to incorporation of a second header. The results are presented in terms of mass flow rate distributions in the tubes of the heat exchanger and their standard deviations. The results indicate that the inlet flow velocity has insignificant influence on maldistribution while the nozzle geometry shape has a slight effect. Also, the results indicate that reducing the nozzle diameter results in an increase in the flow maldistribution. A 25% increase is obtained in the standard deviation as a result of decreasing the diameter by 25%. Increasing the number of nozzles has a significant influence on the maldistribution. A reduction of 62.5% in the standard deviation of the mass flow rate inside the tubes is achieved by increasing the number of nozzles from 2 to 4. The results indicate that incorporating a second header results in a significant reduction in the flow maldistribution. A 50% decrease in the standard deviation is achieved as a result of incorporation of a second header of seven holes. It is also found that the hole-diameter distribution at the exit of the second header has a slight influence on the flow maldistribution. Correlations of the flow maldistribution in terms of the investigated parameters are presented.

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Dynamics of shell‐and‐tube heat exchangers to arbitrary temperature and step flow variations

Cited by 25 publications

References 9 publications

Evaluation of flow maldistribution in air-cooled heat exchangers

Evaluation of flow maldistribution in air-cooled heat exchangers

Dynamic object-oriented heat exchanger models for simulation of fluid property transitions

Correlations of flow maldistribution parameters in an air cooled heat exchanger

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