Experimental Investigation of Convective Heat Transfer in a Narrow Rectangular Channel for Upward and Downward Flows

Jo, Daeseong; Al-Yahia, Omar S.; Altamimi, Ragai; Park, Jonghark; Chae, Hobyung

doi:10.5516/net.02.2013.057

Cited by 44 publications

(21 citation statements)

References 13 publications

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“…Tipe ini dipilih dikarenakan harga murah dengan konstruksi yang cukup mudah dikerjakan. Dengan jumlah ruang yang lebih tinggi ditempati dibandingkan dengan tipe lainnya [3] .Tipe lain yang digunakan untuk memperlihatkan proses pemindahan panas dan karakteristik perpindahan panas juga dilakukan pada tipe Rectangular Channel [4] .…”

Section: Pendahuluanunclassified

“…Salah satu karakteristik dari perpindahan panas yang terjadi pada Double Pipe Heat Exchanger ini adalah tentang distribusi koefisien perpindahan panas konveksi yang terjadi pada daerah entrance dan fully developed. Hampir serupa dengan yang dilakukan pada tipe Rectangular Channel, perpindahan panas konveksi juga diteliti pada tipe ini [4] . Hasil penelitian memperlihatkan tren distribusi koefisien perpindahan panas konveksi pada daerah entrance dan fully developed, sama baik secara eksperimen maupun secara empiris.…”

Section: Pendahuluanunclassified

“…Hasil penelitian memperlihatkan tren distribusi koefisien perpindahan panas konveksi pada daerah entrance dan fully developed, sama baik secara eksperimen maupun secara empiris. Koefisien perpindahan panas konveksi memiliki distribusi nilai yang tinggi pada daerah dekat inlet yang kemudian menurun seiring dengan menjauh daerah inlet yang bersamaan dengan bertambah tebalnya boundary layer thermal hingga mencapai daerah fully developed [4,5] . Dikatakan bahwa penelitian yang sering dilakukan sebelumnya kebanyakan pada daerah fully developed.…”

Section: Pendahuluanunclassified

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Distribusi Koefisien Perpindahan Panas Konveksi Daerah Entrance dan Fully Developed Perbandingan Empiris dan Eksperimen pada Double Pipe Heat Exchanger

Maa

2015

elementer

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AbstrakPenelitian tentang distribusi koefisien konveksi pada daerah entrance dan fully developed sangat diperhitungkan dalam dunia industri makanan, minuman, proses kimia dan farmasi. Penelitian ini dilakukan secara eksperimental dengan menggunakan Double Pipe Heat Exchanger. Hal ini karena konstruksi yang sederhana, murah, yang tidak memerlukan permukaan perpindahan panas yang besar. Penelitian ini mengkaji tentang distribusi koefisien konveksi yang terjadi di daerah entrance dan fully developed. Fluida yang digunakan adalah air yang mengalir secara paralel. Debit aliran panas divariasikan pada 5 kecepatan aliran mulai dari 6,7 lpm hingga 20 lpm dengan laju aliran 0,11 kg/s hingga 0,33 kg/s menggunakan temperatur dijaga pada 60 o C. Sedangkan debit fluida dingin divariasikan pada 4 kecepatan aliran mulai 10 lpm hingga 20 lpm dengan laju aliran 0,17 kg/s hingga 0,33 kg/s dengan temperatur 32 o C. Hasil yang didapatkan pada penelitian ini adalah distribusi koefisien perpindahan panas secara konveksi yang terjadi pada daerah entrance dan fully developed. Batas daerah entrance pada Doubel Pipe Heat Exchanger ini adalah 30 cm. Selanjutnya masuk pada daerah fully developed, seiring dengan bertambah tebalnya boundary layer termal hingga mencapai konstan. Kata kunci:koefisien konveksi, perpndahan panas, entrance, fully developed, double pipe heat exchangerAbstract Research on the distribution of convection coefficient in the entrance and fully developed area is highly regarded in food, beverage, chemical and pharmaceutical processes. This research was carried out experimentally by using Double Pipe Heat Exchanger. This is because the construction is simple, inexpensive, that does not require a large heat transfer surface. This study examined the distribution coefficient of convection occurs in the entrance area and fully developed. Fluid used water flowing in parallel. Heat flow rate varied at 5 flow rate ranging from 6.7 lpm to 20 lpm at a flow rate of 0.11 kg / s up to 0.33 kg / s using the temperature is maintained at 60 o C. While the cold fluid discharge flow rate varied 4 from 10 lpm to 20 lpm at a flow rate of 0.17 kg / s up to 0.33 kg / s with a temperature of 32 o C. The results obtained in this study is the convection heat transfer coefficient distribution that occurred in the entrance and fully developed. Border entrance in Doubel Pipe Heat Exchanger is 30 cm. The next entry in fully developed areas, along with the thermal boundary layer thickness increases until it reaches a constant.

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Section: Pendahuluanunclassified

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Distribusi Koefisien Perpindahan Panas Konveksi Daerah Entrance dan Fully Developed Perbandingan Empiris dan Eksperimen pada Double Pipe Heat Exchanger

Maa

2015

elementer

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“…Inside the coil, authors decided to use the Dittus-Boelter correlation for dimensionless heat transfer coefficient [26] Nu DB = 0.023Re…”

Section: Heat Exchanger Modelingmentioning

confidence: 99%

“…The pressure drop due to contraction was estimated using a flow model recommended by Hewitt et al [26] for single phase flow.…”

Section: Data Reductionmentioning

confidence: 99%

Performance analyses of helical coil heat exchangers. The effect of external coil surface modification on heat exchanger effectiveness

Andrzejczyk¹,

Muszyński²

2016

Archives of Thermodynamics

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The shell and coil heat exchangers are commonly used in heating, ventilation, nuclear industry, process plant, heat recovery and air conditioning systems. This type of recuperators benefits from simple construction, the low value of pressure drops and high heat transfer. In helical coil, centrifugal force is acting on the moving fluid due to the curvature of the tube results in the development. It has been long recognized that the heat transfer in the helical tube is much better than in the straight ones because of the occurrence of secondary flow in planes normal to the main flow inside the helical structure. Helical tubes show good performance in heat transfer enhancement, while the uniform curvature of spiral structure is inconvenient in pipe installation in heat exchangers. Authors have presented their own construction of shell and tube heat exchanger with intensified heat transfer. The purpose of this article is to assess the influence of the surface modification over the performance coefficient and effectiveness. The experiments have been performed for the steady-state heat transfer. Experimental data points were gathered for both laminar and turbulent flow, both for co current-and countercurrent flow arrangement. To find optimal heat transfer intensification on the shell-side authors applied the number of transfer units analysis.

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Core design of long‐cycle small modular lead‐cooled fast reactor

et al. 2018

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Summary A core design of small modular liquid‐metal fast reactor (SMLFR) cooled by lead‐bismuth eutectic (LBE) was developed for power reactors. The main design constraint on this reactor is a size constraint: The core needs to be small enough so that (1) it can be transported in a spent nuclear fuel (SNF) cask to meet the electricity demands in remote areas and off‐grid locations or so that (2) it can be used as a power source on board of nuclear icebreaker ships. To satisfy this design requirement, the active core of the reactor is 1 m in height and 1.45 m in diameter. The reactor is fueled with natural and 13.86% low‐enriched uranium nitride (UN), as determined through an optimization study. The reactor was designed to achieve a thermal power of 37.5 MW with an assumption of 40% thermal efficiency by employing an advanced energy conversion system based on supercritical carbon dioxide (S‐CO2) as working fluid, in which the Brayton cycle can achieve higher conversion efficiencies and lower costs compared to the Rankine cycle. The outer region of the core with low‐enriched uranium (LEU) performs the function of core ignition. The center region plays the role of a breeding blanket to increase the core lifetime for long cycle operation. The core working fluid inlet and outlet temperatures are 300°C and 422°C, respectively. The primary coolant circulation is driven by an electromagnetic pump. Core performance characteristics were analyzed for isotopic inventory, criticality, radial and axial power profiles, shutdown margins (SDM), reactivity feedback coefficients, and integral reactivity parameters of the quasi‐static reactivity balance. It is confirmed through depletion calculations with the fast reactor analysis code system Argonne Reactor Computation (ARC) that the designed reactor can be operated for 30 years without refueling. Preliminary thermal‐hydraulic analysis at normal operation is also performed and confirms that the fuel and cladding temperatures are within normal operation range. The safety analysis performed with the ARC code system and the UNIST Monte Carlo code MCS shows that the conceptual core is favorable in terms of self‐controllability, which is the first step towards inherent safety.

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Experimental Investigation of Convective Heat Transfer in a Narrow Rectangular Channel for Upward and Downward Flows

Cited by 44 publications

References 13 publications

Distribusi Koefisien Perpindahan Panas Konveksi Daerah Entrance dan Fully Developed Perbandingan Empiris dan Eksperimen pada Double Pipe Heat Exchanger

Distribusi Koefisien Perpindahan Panas Konveksi Daerah Entrance dan Fully Developed Perbandingan Empiris dan Eksperimen pada Double Pipe Heat Exchanger

Performance analyses of helical coil heat exchangers. The effect of external coil surface modification on heat exchanger effectiveness

Core design of long‐cycle small modular lead‐cooled fast reactor

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