The Experts below are selected from a list of 255 Experts worldwide ranked by ideXlab platform
Ilker Tari - One of the best experts on this subject based on the ideXlab platform.
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shell side cfd analysis of a small shell and tube heat exchanger
Energy Conversion and Management, 2010Co-Authors: Ender Ozden, Ilker TariAbstract:Abstract The shell side design of a shell-and-tube heat exchanger; in particular the Baffle spacing, Baffle Cut and shell diameter dependencies of the heat transfer coefficient and the pressure drop are investigated by numerically modeling a small heat exchanger. The flow and temperature fields inside the shell are resolved using a commercial CFD package. A set of CFD simulations is performed for a single shell and single tube pass heat exchanger with a variable number of Baffles and turbulent flow. The results are observed to be sensitive to the turbulence model selection. The best turbulence model among the ones considered is determined by comparing the CFD results of heat transfer coefficient, outlet temperature and pressure drop with the Bell–Delaware method results. For two Baffle Cut values, the effect of the Baffle spacing to shell diameter ratio on the heat exchanger performance is investigated by varying flow rate.
Ender Ozden - One of the best experts on this subject based on the ideXlab platform.
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shell side cfd analysis of a small shell and tube heat exchanger
Energy Conversion and Management, 2010Co-Authors: Ender Ozden, Ilker TariAbstract:Abstract The shell side design of a shell-and-tube heat exchanger; in particular the Baffle spacing, Baffle Cut and shell diameter dependencies of the heat transfer coefficient and the pressure drop are investigated by numerically modeling a small heat exchanger. The flow and temperature fields inside the shell are resolved using a commercial CFD package. A set of CFD simulations is performed for a single shell and single tube pass heat exchanger with a variable number of Baffles and turbulent flow. The results are observed to be sensitive to the turbulence model selection. The best turbulence model among the ones considered is determined by comparing the CFD results of heat transfer coefficient, outlet temperature and pressure drop with the Bell–Delaware method results. For two Baffle Cut values, the effect of the Baffle spacing to shell diameter ratio on the heat exchanger performance is investigated by varying flow rate.
Kun Yang - One of the best experts on this subject based on the ideXlab platform.
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Numerical Investigation and Optimization on Shell Side Performance of A Shell and Tube Heat Exchanger with Inclined Trefoil-Hole Baffles
Energies, 2019Co-Authors: Yue Sun, Xinting Wang, Rui Long, Fang Yuan, Kun YangAbstract:In this work, a shell and tube heat exchanger with inclined trefoil-hole Baffles (STHX-IT) is proposed, and the numerical simulation is conducted to investigate the flow and heat transfer characteristics. A shell and tube heat exchanger with segmental Baffles (STHX-SG) is also studied for the performance comparison. The results show that the heat transfer coefficient and pressure drop of the STHX-IT is averagely lower by 23.89% and 44.19% than those of the STHX-SG, but the heat transfer coefficient per pressure drop is higher by 36.38% on average. Further, the parametric studies of the inclination angle θ, trefoil-hole number n, and Baffle Cut δ are carried out for the STHX-IT. According to the numerical results, n and δ have more notable influence on shell side performance than θ. In detail, the heat transfer coefficient and pressure drop decrease slightly with θ increasing, and the overall performance is approximately equal; both the heat transfer coefficient and pressure drop decrease with the respective rising of n and δ, but the comprehensive performance shows a growing trend. Considering the synthetic effects of structural parameters, the multi-objective structure optimization using the genetic algorithm combined with the artificial neural networks is fulfilled. As a result, the Pareto front is obtained to characterize the behaviors of the maximum heat transfer rate and minimum pressure drop. The STHX-IT with the θ = 5.38°, n = 6, and δ = 43% is decided as the optimal solution by the TOPSIS method, whose Q/Δp is 2.34 times as much as that of the original STHX-SG.
Dwiyantoro, Bambang Arip - One of the best experts on this subject based on the ideXlab platform.
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Studi Numerik Pengaruh Baffle Inclination Pada Alat Penukar Kalor Tipe Shell And Tube Terhadap Aliran Fluida Dan Perpindahan Panas
'Lembaga Penelitian dan Pengabdian kepada Masyarakat ITS', 2014Co-Authors: Arnaw, Rezky Fadil, Dwiyantoro, Bambang AripAbstract:Heat exchanger atau alat penukar kalor merupakan suatu peralatan yang digunakan untuk memindahkan sejumlah energi dalam bentuk panas dari satu fluida ke fluida yang lain. Perpindahan panas tersebut terjadi dari suatu fluida yang suhunya lebih tinggi ke fluida lain yang suhunya lebih rendah. Pada tugas akhir ini akan dilakukan penelitian tentang pengaruh Baffle inclination terhadap aliran fluida dan perpindahan panas pada alat penukar kalor tipe shell and tube. Dalam penelitian ini akan dilakukan tiga variasi sudut Baffle inclination yaitu 0º, 10° dan 20° dengan besar laju aliran massa yang divariasikan yaitu sebesar 0.5 kg/s, 1 kg/s dan 2 kg/s. Tipe Baffle yang digunakan adalah single segmental Baffle dengan Baffle Cut sebesar 36% dan menggunakan arah aliran jenis parallel. Hasil analisa simulasi menunjukkan bahwa laju aliran massa yang meningkat akan menyebabkan kenaikan pressure drop yang cukup drastis dan penurunan temperatur outlet. Alat penukar kalor dengan Baffle inclination 0° memiliki nilai perpindahan panas terbaik jika dibandingkan dengan Baffle inclination 10° dan 20°
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Studi Numerik Pengaruh Baffle Inclination Pada Alat Penukar Kalor Tipe U – Tube Terhadap Aliran Fluida Dan Perpindahan Panas
'Lembaga Penelitian dan Pengabdian kepada Masyarakat ITS', 2014Co-Authors: Hidayatullah Reza, Dwiyantoro, Bambang AripAbstract:Alat penukar kalor sangat berpengaruh dalam industri terhadap keberhasilan keseluruhan rangkaian proses, karena kegagalan operasi alat ini baik akibat kegagalan mekanikal maupun opersional dapat menyebabkan berhentinya operasi unit. Penelitian terhadap desain heat exchanger masih terus dilakukan untuk mencari kinerja dari heat exchanger yang paling optimal, baik pada bagian Baffle Cut dan Baffles inclination maupun susunan dari tube dengan menggunakan heat exchanger ukuran kecil sebagai model. Berdasarkan pada permasalahan di atas, maka dilakukan penelitian terhadap kinerja heat exchanger tipe U-tube dengan memvariasikan Baffle inclination. Penelitian ini dilakukan secara numerik dengan variasi Baffle inclination sebesar 0o, 10o, 20o dan variasi laju aliran massa sebesar 0,5 kg/s, 1kg/s, dan 2 kg/s. Tube yang digunakan adalah tipe U-tube yang disusun secara persegi. Model viskous yang digunakan adalah turbulensi model yaitu k-ε standar, dimana fluida yang digunakan adalah air pada boundary condition. Hasil analisa numerik menunjukkan adanya pengaruh Baffle inclination pada alat penukar kalor tipe U – tube terhadap aliran fluida dan perpindahan panas. Peningkatan laju aliran massa dapat meningkatkan pressure drop secara cepat, alat penukar kalor shell and tube tipe U – tube dengan Baffle inclination 20o memiliki unjuk kerja yang terbaik dibandingkan dengan Baffle inclination 0o dan 10o
Xinting Wang - One of the best experts on this subject based on the ideXlab platform.
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Numerical Investigation and Optimization on Shell Side Performance of A Shell and Tube Heat Exchanger with Inclined Trefoil-Hole Baffles
Energies, 2019Co-Authors: Yue Sun, Xinting Wang, Rui Long, Fang Yuan, Kun YangAbstract:In this work, a shell and tube heat exchanger with inclined trefoil-hole Baffles (STHX-IT) is proposed, and the numerical simulation is conducted to investigate the flow and heat transfer characteristics. A shell and tube heat exchanger with segmental Baffles (STHX-SG) is also studied for the performance comparison. The results show that the heat transfer coefficient and pressure drop of the STHX-IT is averagely lower by 23.89% and 44.19% than those of the STHX-SG, but the heat transfer coefficient per pressure drop is higher by 36.38% on average. Further, the parametric studies of the inclination angle θ, trefoil-hole number n, and Baffle Cut δ are carried out for the STHX-IT. According to the numerical results, n and δ have more notable influence on shell side performance than θ. In detail, the heat transfer coefficient and pressure drop decrease slightly with θ increasing, and the overall performance is approximately equal; both the heat transfer coefficient and pressure drop decrease with the respective rising of n and δ, but the comprehensive performance shows a growing trend. Considering the synthetic effects of structural parameters, the multi-objective structure optimization using the genetic algorithm combined with the artificial neural networks is fulfilled. As a result, the Pareto front is obtained to characterize the behaviors of the maximum heat transfer rate and minimum pressure drop. The STHX-IT with the θ = 5.38°, n = 6, and δ = 43% is decided as the optimal solution by the TOPSIS method, whose Q/Δp is 2.34 times as much as that of the original STHX-SG.
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numerical analysis and optimization study on shell side performances of a shell and tube heat exchanger with staggered Baffles
International Journal of Heat and Mass Transfer, 2018Co-Authors: Xinting Wang, Nianben Zheng, Zhichun Liu, Wei LiuAbstract:Abstract With a view to possessing the characteristics of the simple fabrication of the shell and tube heat exchanger with segmental Baffles (STHX-SG) and the helical flow of the shell and tube heat exchanger with continuous helical Baffles (STHX-CH), a shell and tube heat exchanger with staggered Baffles (STHX-ST) is proposed in this work. The Baffles of the STHX-ST are arranged according to a certain rule that the adjacent Baffles are staggered by a constant clockwise or counterclockwise angle in sequence. Comparisons of the heat transfer performance and pressure drop among the STHX-SG, STHX-CH, and STHX-ST are firstly carried out. Results show that the comprehensive performance of the STHX-ST is superior the STHX-SG and STHX-CH. The parametric studies about the Baffle Cut δ and staggered angle β are conducted for the STHX-ST. Moreover, the multi-objective optimization is carried out to obtain the optimal solutions using the genetic algorithm further. The relationships between the design variables (the Baffle Cut δ, staggered angle β, and number of Baffles n) and objective functions (the heat transfer rate Q and pressure drop Δp) are characterized by the artificial neural networks. The STHX-ST, at the δ = 0.45, β = 79°, and n = 11, is determined as the optimal solution according to the TOPSIS selection. Meanwhile, it is proved that the STHX-SG, a special STHX-ST at the β = 180°, is not always the best choice from the view of heat transfer enhancement. The STHX-ST can provide a preferable and meaningful solution for more efficient energy utilization in industrial applications.
