| 1. |
- Pourian, Jan, 1962-, et al.
(author)
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Modelling of the channelling phenomenon of the pulping digester using porous Media
- 2009
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In: <em>SIMS, Scandinavian Modelling and Simulation Society 50, conference in Fredrice, Denmark, October 7-8 (2009)</em>. - Fredrice : SIMS electronic.
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Conference paper (peer-reviewed)abstract
- A dynamic model is developed for a continuous pulping digester to characterize the channeling phenomenon. The commercial CFD codes, FLUENT, are used to compute the hydraulic behavior of the digester under the normal and particular operational conditions. All the circulation flows, extractions, multiple inlets and outlets are included in this model. The digester is designed in the Gambit and an axisymmetric 2d model is applied. A porous scheme is implemented in the model in order to design the fluid flow and channelling phenomenon inside the digester. A heterogeneous porous media is specified in order to take the compression of the pulp into account. The simulation can serves as a prognosis model to predict the risk situations and probably to hinder high economical damage. The k- model contributes to compute the flow “regimes” or eventual eddies in some turbulent zones of the digester.
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| 2. |
- Pourian, Jan, 1962-, et al.
(author)
-
Numerical and experimental study of the inclined free fins applied for thermal management
- 2009
-
Conference paper (peer-reviewed)abstract
- A new design for copper base heatsink is proposed in this work. In some experimental and numerical simulation efforts, optimizing and predicting of the thermal characterization of the heatsink with inclined free fins is developed. The proposed copper heatsink has high thermal dissipation capability and lower weight and volume compare to current aluminum and copper heatsinks.The model is scaled up in the fluent environment to predict its application in the cooling of larger heat generated electronic devices.Free fin denotes that the fins are not integrated chemically by casting methods and also implies that the proposed heatsink consist of individual and separated fins that are assembled and holds together. Impingement air-cooling mode of force-convection is adopted for heat dissipation from high power electronic devices in associated with the proposed inclined fin model. In addition to larger surface area and airflow velocity another solution for enhancement of heat dissipation is suggested. A numerical evaluation of thermal performance of the suggested heatsink and fluid flow around the fins is performed. The thermal performance is estimated also by experimental variables. The results of experimental investigation and CFD studies are introduced in this paper. Construction method of proposed heatsink by suggested fin design is introduced. This heat sink is fabricated mechanically and is tested by a number of heat sources and high sensitive devices such as adhesive k type thermocouple, data acquisition 34970A in associated with HP Bench Link program. Components of airflow velocity in the hollow spaces of the heatsink are discussed. Pressure drop and other thermal variables are analyzed analytical and by CFD code
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| 3. |
- Pourian, Jan, 1962-, et al.
(author)
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Numerical modeling of two proposed mechanically fabricated free-fins heat sinks
- 2009
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In: Proceedings of EuroSimE 2009. - 9781424441594 ; , s. 393-404
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Conference paper (peer-reviewed)abstract
- Two new designs for copper base heat sink is proposed in this work. In some experimental and numerical simulation efforts, optimizing and predicting of the thermal characterization of the heat sink with inclined free fins is developed. A new design of the base and fins optimized both with respect to manufacture ability and performance is introduced. The proposed copper heat sinks have high thermal dissipation capability and lower weight and volume compare to current aluminum and copper heat sinks. The inclined free fins model is scaled up in the fluent environment to predict its application in the cooling of larger heat generated electronic devices. Free fin denotes that the fins are not integrated chemically by casting methods and also implies that the proposed heat sink consist of individual and separated fins that are assembled and holds together. Impingement air-cooling mode of force-convection is adopted for heat dissipation from high power electronic devices in associated with the proposed inclined fin model. The hydraulic parameters computed for square fin model include velocity profiles, distribution of static pressure, dynamic pressure, boundary layer and fluid temperature between the fins and in the passageway at the middle of the heat sink. Furthermore 3-dimensional temperature distribution through the fins and base and heat source is predicted. In addition to larger surface area and airflow velocity another solution for enhancement of heat dissipation is suggested. Numerical prediction of the thermal performance of the free fins heat sink is conducted. The thermal performance is also estimated by experimental efforts. The results of experimental investigation and CFD studies are introduced in this paper. Construction method of proposed heat sinks by suggested fin design is introduced. The free fin heat sink is fabricated mechanically and is tested by a number of heat sources and high sensitive devices such as adhesive k type thermocouple, data acquisition 34970A in associated with HP Bench Link program. Components of airflow velocity in the hollow spaces of the heat sink are discussed. Pressure drop and other thermal variables are analyzed analytically and by CFD code.
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