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Adsorption analysis of ammonia in an aqueous solution

Description: An analysis is carried out to determine the effects of the diffusional resistance on the rate of the adsorption of ammonia in an aqueous solution. A performance prediction model is developed to calculate the local rate of heat and mass transfer, including physical and thermodynamic property calculations of the mixture. An algorithm is developed for calculating the interfacial conditions. The local heat- and mass-transfer calculation is then incorporated into the performance prediction method fo… more
Date: August 1, 1993
Creator: Arman, B. & Panchal, C. B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Condensation analysis for plate-frame heat exchangers

Description: A theoretical analysis is presented to predict single component and binary-mixture condensation in plate-frame heat exchangers. A thermodynamic property model based on the Peng-Robinson equation of state was developed for the binary-mixture equilibrium and formulated into a performance prediction program. A set of equations was formulated and a calculation algorithm was developed to predict the local rate of heat and mass transfer for binary mixtures. Friction-factor and heat-transfer-coefficie… more
Date: July 1, 1995
Creator: Arman, B. & Rabas, T. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Disruption shape effects on the performance of enhanced tubes with the separation and reattachment mechanism

Description: A non-orthogonal, body-fitted numerical code is used to determine the thermo-hydraulic performance of enhanced tubes with transverse periodic sine-, semicircle-, arc-, and trapezoid-shaped disruptions. The turbulence closure was achieved with a two-layer turbulence model. It is shown that there is a tradeoff of the heat-transfer and pressure-drop performances when the disruption shape becomes more contoured; that is, both the heat transfer and the pressure drop increase. The local heat transfer… more
Date: August 1, 1992
Creator: Arman, B. & Rabas, T. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Disruption shape effects on the performance of enhanced tubes with the separation and reattachment mechanism

Description: A non-orthogonal, body-fitted numerical code is used to determine the thermo-hydraulic performance of enhanced tubes with transverse periodic sine-, semicircle-, arc-, and trapezoid-shaped disruptions. The turbulence closure was achieved with a two-layer turbulence model. It is shown that there is a tradeoff of the heat-transfer and pressure-drop performances when the disruption shape becomes more contoured; that is, both the heat transfer and the pressure drop increase. The local heat transfer… more
Date: January 1, 1992
Creator: Arman, B. & Rabas, T. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Influence of Prandtl number and effects of disruption shape on the performance of enhanced tubes with the separation and reattachment mechanism

Description: The pressure-drop and heat-transfer performance of an enhanced tube with transverse disruptions can be predicted with a numerical modeling method, an accomplishment not previously achieved. Two computer codes were employed to achieve this goal - an orthogonal code and a nonorthogonal, body-fitted code. The turbulence closure was achieved with a two-layer turbulence model. The orthogonal computer code was used to determine the influence of the Prandti number. The numerical simulations demonstrat… more
Date: April 1, 1992
Creator: Arman, B. & Rabas, T. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Influence of Prandtl number and effects of disruption shape on the performance of enhanced tubes with the separation and reattachment mechanism

Description: The pressure-drop and heat-transfer performance of an enhanced tube with transverse disruptions can be predicted with a numerical modeling method, an accomplishment not previously achieved. Two computer codes were employed to achieve this goal - an orthogonal code and a nonorthogonal, body-fitted code. The turbulence closure was achieved with a two-layer turbulence model. The orthogonal computer code was used to determine the influence of the Prandti number. The numerical simulations demonstrat… more
Date: April 1, 1992
Creator: Arman, B. & Rabas, T. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The influence of the rib width on the performance of tubes with the separation and reattachment enhancement mechanism

Description: This paper presents numerically predicted turbulent heat-transfer and friction-factor results for tubes with transverse, rectangular ribs for different width-to-height ratios. The rib spacing was maintained at values where the separated flow over the rib reattached between adjacent ribs (i.e. the separation and reattachment enhancement mechanism). The mean Nusselt number was found to decrease slightly with an increase in the width to height ratio for low Prandtl number fluids (Pr = 0.71). Howev… more
Date: December 1, 1992
Creator: Arman, B. & Rabas, T. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The influence of the rib width on the performance of tubes with the separation and reattachment enhancement mechanism

Description: This paper presents numerically predicted turbulent heat-transfer and friction-factor results for tubes with transverse, rectangular ribs for different width-to-height ratios. The rib spacing was maintained at values where the separated flow over the rib reattached between adjacent ribs (i.e. the separation and reattachment enhancement mechanism). The mean Nusselt number was found to decrease slightly with an increase in the width to height ratio for low Prandtl number fluids (Pr = 0.71). Howev… more
Date: January 1, 1992
Creator: Arman, B. & Rabas, T. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Performance comparisons of enhanced tubes with discrete and wavy disruption shapes

Description: This paper presents comparisons of the friction factors and heat-transfer coefficients obtained with enhanced tubes with transverse discrete and almost transverse wavy two-dimensional disruptions. Both experimental data and numerical predictions were used for the comparisons. For the latter a two-layer turbulence model incorporated in a body-fitted, finite-volume method was used. The disruption shape, discrete or wavy, depends on the manufacturing process. If an extrusion process is used, discr… more
Date: August 1, 1993
Creator: Arman, B. & Rabas, T. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Recovery and separation of high-value plastics from discarded household appliances

Description: Argonne National Laboratory is conducting research to develop a cost- effective and environmentally acceptable process for the separation of high-value plastics from discarded household appliances. The process under development has separated individual high purity (greater than 99.5%) acrylonitrile-butadiene-styrene (ABS) and high- impact polystyrene (HIPS) from commingled plastics generated by appliance-shredding and metal-recovery operations. The process consists of size-reduction steps for t… more
Date: March 1996
Creator: Karvelas, D. E.; Jody, B. J.; Poykala, J. A., Jr.; Daniels, E. J. & Arman, B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The effect of the exit condition on the performance of intube condensers

Description: Data collected from the open literature plus some new, unpublished data will be used to show that the exit condition can change the flow regimes, introduce certain types of instabilities, and alter flooding velocities with intube condensation. The major orientations will be considered: horizontal, vertical with vapor downflow, and vertical with vapor upflow (refluxing).
Date: July 1, 1995
Creator: Rabas, T. J. & Arman, B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The influence of the Prandtl number on the thermal performance of tubes with the separation and reattachment enhancement mechanism

Description: This paper demonstrates that the heat-transfer performance of an enhanced tube with transverse, rectangular disruptions can be predicted with a numerical modeling method, an accomplishment not previously achieved. This computer code is then used to determine the influence of the Prandtl number. The numerical simulation demonstrated that six distinct regions exist: the three rib surfaces, the upstream and downstream recirculation regions, and the boundary-layer development zone. Three zones domi… more
Date: August 1, 1992
Creator: Rabas, T. J. & Arman, B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The influence of the Prandtl number on the thermal performance of tubes with the separation and reattachment enhancement mechanism

Description: This paper demonstrates that the heat-transfer performance of an enhanced tube with transverse, rectangular disruptions can be predicted with a numerical modeling method, an accomplishment not previously achieved. This computer code is then used to determine the influence of the Prandtl number. The numerical simulation demonstrated that six distinct regions exist: the three rib surfaces, the upstream and downstream recirculation regions, and the boundary-layer development zone. Three zones domi… more
Date: January 1, 1992
Creator: Rabas, T. J. & Arman, B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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