Influence of tube and particle diameter on heat transport in packed beds

Borkink, J.G.H.; Westerterp, K.R.

doi:10.1002/aic.690380507

Cited by 48 publications

(25 citation statements)

References 69 publications

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“…The same packed bed setup [32] was studied for Pe numbers between 150 and 2100 by the same researchers [33]. Similar to the previous study, the dimensionless form of Eq.…”

Section: Heatmentioning

confidence: 54%

“…It was found that the radial effective thermal conductivity can be described based on the value of tube-to-particle diameter ratio rather than the individual tube and particle diameters. Borkink and Westerterp [32] studied a cylindrical packed bed with glass spheres of two different diameters as 3.7 mm for the Peclet number range of 60-300 and 7.2 mm for the Peclet number range of 100-800. Moreover, porous alumina cylinders for 50 < Pe < 450 and porous alumina Raschig rings for 100 < Pe < 450 were studied.…”

Section: Heatmentioning

confidence: 99%

“…Calculated Neglected A reported correlation was used Smirnov et al [23][24][25] X X Thomeo and Freire [26] X X Demirel et al [27] X X Bunnell et al [28] X X Wen and Ding [29] X X Dixon and van Dongeren [30] X X Borkink and Westerterp [32,33] X X Borkink and Westerterp [34] X X Kwong and Smith [35] X X Bey and Eigenberger [36] X X Jorge et al [38] X X Dekhtyar et al [40] X X Gunn and Khalid [41] X X Gunn and De Souza [43] X X Clement and Jorgensen [44] X X Levec and Carbonell [45] X X Elsari and Hughes [46] X X Yagi et al [47] X X Vortuba et al [48] X X Vortmeyer and Adam [49] X X Metzger et al [51] X X Testu et al [52,53] X X Water, 0 < Re < 18…”

Section: A Reported Correlation Was Usedmentioning

confidence: 99%

See 2 more Smart Citations

Thermal Dispersion in Porous Media—A Review on the Experimental Studies for Packed Beds

Özgümüş¹,

Mobedi²,

Özkol

et al. 2013

Applied Mechanics Reviews

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Thermal dispersion is an important topic in the convective heat transfer in porous media. In order to determine the heat transfer in a packed bed, the effective thermal conductivity including both stagnant and dispersion thermal conductivities should be known. Several theoretical and experimental studies have been performed on the determination of the effective thermal conductivity. The aim of this study is to review the experimental studies done on the determination of the effective thermal conductivity of the packed beds. In this study, firstly brief information on the definition of the thermal dispersion is presented and then the reported experimental studies on the determination of the effective thermal conductivity are summarized and compared. The reported experimental methods are classified into three groups: (1) heat addition/removal at the lateral boundaries, (2) heat addition at the inlet/ outlet boundary, (3) heat addition inside the bed. For each performed study, the experimental details, methods, obtained results, and suggested correlations for the determination of the effective thermal conductivity are presented. The similarities and differences between experimental methods and reported studies are shown by tables. Comparison of the correlations for the effective thermal conductivity is made by using figures and the results of the studies are discussed.

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“…The same packed bed setup [32] was studied for Pe numbers between 150 and 2100 by the same researchers [33]. Similar to the previous study, the dimensionless form of Eq.…”

Section: Heatmentioning

confidence: 54%

Section: Heatmentioning

confidence: 99%

Section: A Reported Correlation Was Usedmentioning

confidence: 99%

See 1 more Smart Citation

Thermal Dispersion in Porous Media—A Review on the Experimental Studies for Packed Beds

Özgümüş¹,

Mobedi²,

Özkol

et al. 2013

Applied Mechanics Reviews

View full text Add to dashboard Cite

show abstract

“…According to Golebiowski and Wasala (1973), Crider gives the value of 6.133. Borkink and Westerterp (1992) fitted their experimental results by a CORR value of 7.4 for various types of packings. A comprehensive review on the value of CORR has been carried out by Derkx and Dixon (1996).…”

Section: Boundary Conditionsmentioning

confidence: 97%

Operation of an industrial steam reformer under severe condition: A simulation study

2008

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A rigorous two-dimensional model is developed for simulating the operation of a less-investigated type steam reformer having a considerably lower operating Reynolds number, higher tube diameter, and non-availability of extra steam in the feed compared with conventional steam reformers. Simulation results show that reasonable predictions can only be achieved when certain correlations for wall to fluid heat transfer equations are applied. In all cases, strong radial temperature gradients inside the reformer tubes have been found. Furthermore, the results show how a certain catalyst loading profile will affect the operation of the reformer.Un modèle bidimensionnel rigoureux est mis au point pour simuler le fonctionnement d'un reformeurà vapeur d'un type qui aété moinś etudié, ayant un nombre de Reynolds de fonctionnement bas, un diamètre de tubeélevé et une non disponibilité de vapeur excédentaire dans l'alimentation comparativement aux reformeurs de vapeur classiques. Les résultats de simulation montrent que des prédictions raisonnables peuventêtre obtenues seulement lorsque certaines corrélations pour leséquations de transfert de chaleur de la paroi vers le fluide sont appliquées. Dans tous les cas, de forts gradients de température radiaux dans les tubes de reformeur ontété trouvés. En outre, les résultats montrent comment un certain profil de chargement de catalyseur influe le fonctionnement du reformeur.

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“…Mekanisme perpindahan panas dalam serbuk statis (tidak terdapat aliran fluida) dapat digambarkan sebagai berikut [3,4]: a. Konduksi termal terjadi melalui fluida stagnan (not flowing). b. konduksi termal melalui padatan.…”

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Karakteristik Distribusi Temperatur Build Part pada Proses Pressureless Indirect Sintering

Widyanto

Syaiful

2011

jtm

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ABSTRAKFenomena curling pada produk rapid prototyping (RP) merupakan persoalan aktual yang belum teratasi dengan baik. Demikian halnya pada produk hasil proses multi material deposition indirect sintering (MMD-Is). Salah satu penyebabnya adalah distribusi temperatur build part yang tidak seragam. Berbeda dengan proses sintering pada mesin-mesin RP pada umumnya, sintering pada proses MMD-Is dikerjakan dalam lingkungan supporting powder dengan sumber panas berasal dari luar dinding build part. Penelitian ini bertujuan untuk menentukan pengaruh bahan supporting powder, ukuran partikel dan konfigurasi sistem pemanas pada distribusi temperatur build part. Distribusi temperatur diukur dengan membenamkan beberapa termokopel di dalam supporting powder yang menyatakan variasi posisi radial maupun vertikal. Hasil penelitian menunjukkan bahwa ketidakseragaman temperatur build part antara lain disebabkan oleh fenomena pemanasan sekunder oleh bahan piston.Kata kunci: Distribusi temperatur, supporting powder, build part. ABSTRACT Curling phenomenon on rapid prototyping (RP) product is an actual problem which has not PENDAHULUANPengembangan mesin-mesin RP terus dilakukan untuk meningkatkan kualitas produk, mereduksi ongkos operasi maupun untuk tujuan pengembangan produk-produk khusus. Proses MMD-Is merupakan salah satu pengembangan proses RP untuk pembuatan produk-produk multi material. Berbeda dengan mesin-mesin RP komersial pada umumnya, pendeposisian serbuk (meliputi serbuk produk dan supporting powder) pada proses MMD-Is dipisahkan dari proses sinteringnya. Hal ini menghasilkan beberapa keuntungan antara lain: 1). Konstruksi mesin MMD-Is dapat hanya berupa mesin pendeposisi serbuk produk dan supporting powder (MMD), 2). Proses sintering dapat dilakukan secara terpisah menggunakan mesin furnace pada umumnya. Kondisi ini memberikan keleluasaan pada proses pemilihan bahan produk, 3). Produk yang dihasilkan dapat berupa produk multi material yang pada pengembangan lebih lanjut dapat digunakan sebagai dasar pembuatan produk-produk smart material.Setelah siklus deposisi selesai dilakukan hingga membentuk geometri obyek tiga dimensi dalam tatanan serbuk, proses sintering dilaksanakan. Terdapat dua alternatif pelaksanaan proses sintering, yaitu: 1). Build part dilepaskan dari

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Influence of tube and particle diameter on heat transport in packed beds

Cited by 48 publications

References 69 publications

Thermal Dispersion in Porous Media—A Review on the Experimental Studies for Packed Beds

Thermal Dispersion in Porous Media—A Review on the Experimental Studies for Packed Beds

Operation of an industrial steam reformer under severe condition: A simulation study

Karakteristik Distribusi Temperatur Build Part pada Proses Pressureless Indirect Sintering

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