Estimation of heat transfer parameters in a packed bed

Tsang, T. H.; Edgar, Thomas F.; Hougen, Joel O.

doi:10.1016/0300-9467(76)80006-8

Cited by 25 publications

(8 citation statements)

References 18 publications

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“…The location of the temperature measurement controls the estimation method and the use of the analytical solution of Eq. 4 44, 45. Second, if the pseudo‐homogeneous model is used, Tsotsas et al4 suggested plotting the experimental data on the Bi ‐ Gz diagram.…”

Section: Heat‐transfer Modelsmentioning

confidence: 99%

Pore‐scale simulations of unsteady flow and heat transfer in tubular fixed beds

Magnico

2009

AIChE Journal

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Small tube-to-particle-diameter ratio induces a radial heterogeneity in tubular fixed beds on the particle scale. In this complex topology, theoretical models fail to predict wall-to-fluid heat transfer. In order to be more realistic, a deterministic Bennett method is first used to synthesize two packings with a tube-to-sphere-diameter ratio of 5.96 and 7.8, containing 236 and 620 spheres, respectively. In a second step, unsteady velocity and temperature fields are computed by CFD. In the range of Reynolds number lying between 80 and 160, hydrodynamic results are validated with experimental data. The thermal disequilibrium in the near-wall region is described in detail. Several pseudo-homogeneous models are compared to the numerical simulations. The radial and axial profiles of temperature show a clear agreement with the model of Schlu¨n-der's research group and the model of Martin and Nilles.

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Section: Heat‐transfer Modelsmentioning

confidence: 99%

Pore‐scale simulations of unsteady flow and heat transfer in tubular fixed beds

Magnico

2009

AIChE Journal

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“…The two-dimensional pseudo-homogenous two-parameter model is widely used for describing heat transfer phenomena in packed beds (De Wasch and Froment, 1972;Tsang et al, 1976). For a constant wall temperature, the solution of the above model (De Wasch and Froment, 1972) is…”

Section: Estimation Of K Ermentioning

confidence: 99%

Lateral mixing in trickle bed reactors

Babu

Shah

Rao

2007

Chemical Engineering Science

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Knowledge of lateral mixing is essential to understand heat and momentum transfer parameters in both single-phase liquid and two-phase gas-liquid co-current down flow through packed bed columns. The reactors through which gas and liquid concurrently flow downwards through a bed of catalytic packing are called trickle bed reactors. Experimental data on lateral mixing coefficients from both the heat transfer and radial liquid distribution studies are obtained over a wide range of flow rates of gas (0.01.0.898 kg/m 2 s) and liquid (3.16.71.05 kg/m 2 s) using glass spheres (4.05 and 6.75 mm), ceramic spheres (2.59 mm), and ceramic raschig rings (4 and 6.75 mm) as packing materials covering trickle flow, pulse flow, and dispersed bubble flow regimes. In the present work, an expression for estimation of lateral mixing coefficient ( ) L is derived using the data on radial liquid distribution studies. The agreement between the values of ( ) L obtained from heat transfer studies and from radial liquid distribution studies using the experimental data shows that there exists an analogy between the heat transfer and radial liquid distribution in packed beds. Since ( ) L is an important variable for estimation of various heat and mass transfer parameters, a correlation for ( ) L based on present heat transfer study is proposed. The agreement between the ( ) L values estimated from the proposed correlation and experimental values is satisfactory with a standard deviation (s.d.) of 0.119.

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“…In those regions heat transfer at the wall is inhibited by a layer of unmixed fluid. T.H.Tsang, T.F.Edgar and J.O.Hougen [9] presented a new method for estimating the effective heat transfer parameters using limited measurements and a two dimensional homogenous model for a packed bed.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Studies on Packed Bed Using Non Newtonian Fluid

Priyadharisani¹,

Thirumarimurugan²,

Kannadasan³

2011

2011 International Conference on Process Automation, Control and Computing

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This project aims to study and compare the heat transfer characteristics for Countercurrent flow and Parallel Flow through Packed Bed by determining the overall heat transfer coefficient, effectiveness, cold side efficiency and hot side efficiency for water-water system and Carboxymethylcellulose (CMC)-water system with various compositions on volume basis.In Packed Bed, the inlet temperatures of both hot and cold fluids are maintained constant. In performance analysis the flow rate of cold fluid was varied from 3 lpm to 8 lpm for both waterwater system and CMC-water system. The flow rate of hot fluid was maintained constant for both water-water system and CMC-water system. In this work the composition of the CMC-water system were varied from 0.05% to 0.20% on volume basis. The experiments were carried out for both parallel and counter current flow pattern, compared and reported. A physical model was developed using dimensional analysis and fitted with the experimental data. Simulation studies were done using this physical model and compared with the experimental values. The simulation studies were found to agree well with the experimental results.

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Estimation of heat transfer parameters in a packed bed

Cited by 25 publications

References 18 publications

Pore‐scale simulations of unsteady flow and heat transfer in tubular fixed beds

Pore‐scale simulations of unsteady flow and heat transfer in tubular fixed beds

Lateral mixing in trickle bed reactors

Heat Transfer Studies on Packed Bed Using Non Newtonian Fluid

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