“…Therefore, helical coiled tube finds a very goodapplicationintherefrigerationandcryogenicsprocesses. 76,77,397,[499][500][501][502] Fusion technology requirements gave rise to the recent applications of curved tubes for subcooled flow boiling critical heat flux. Celata et al 503 proposed that the curved tubes will be a very useful device for the heat removal from components such as divertors, plasma limiters, neutral beam calorimeters, ion dump, and first-wall arm or that arc subjected to very high heat loads.…”
Section: Axial Dispersion and Mixing Applicationsmentioning
confidence: 99%
“…The heat exchanger was composed of 54 helically coiled tubes separated into three-layer bundles, surrounding the center pipe. Acharya et al, Prabhanjan, , Naphon and Wongwises, ,, Gupta et al, Guobing and Yufeng, and Naphon 78 have shown the application of coiled heat exchangers in various industrial applications (Figure ). 18 (a) U-tube heat exchanger, (b) U-tube double-pipe heat exchanger, and (c) coiled tube reactor …”
Section: Applications Of Coiled Tubesmentioning
confidence: 99%
“…In industrial applications, for example, the evaporators in refrigeration, forced convective evaporation is the dominant process and high heat-transfer efficiency can be obtained under smaller temperature difference between wall and liquid and compact geometries. Therefore, helical coiled tube finds a very good application in the refrigeration and cryogenics processes. ,,,− …”
The potential industrial applications of curved tubes for single- and two-phase flow are reviewed within the
context of physics of flow, trends in the development of technology, and its laboratory to industrial-scale
commercialization. Comparison of the performance of curved tube configurations demonstrates its edge over
the conventional motionless mixers, heat exchangers, and reactors. Alongside, their respective advantages
and limitations are also highlighted. Further, a compendium of the available correlations for single- and two-phase friction factor and heat- and mass-transfer coefficient in curved tubes has also been presented. Key
issues regarding the design parameters governing the performance of the curved tubes for mixing and heat-
and mass-transfer that impact the research, development, and scale-up or scale-down of such devices are also
analyzed. Emerging trends for the development of a new class of curved tubes, namely, inverters and serpentine
and chaotic devices are also presented.
“…Therefore, helical coiled tube finds a very goodapplicationintherefrigerationandcryogenicsprocesses. 76,77,397,[499][500][501][502] Fusion technology requirements gave rise to the recent applications of curved tubes for subcooled flow boiling critical heat flux. Celata et al 503 proposed that the curved tubes will be a very useful device for the heat removal from components such as divertors, plasma limiters, neutral beam calorimeters, ion dump, and first-wall arm or that arc subjected to very high heat loads.…”
Section: Axial Dispersion and Mixing Applicationsmentioning
confidence: 99%
“…The heat exchanger was composed of 54 helically coiled tubes separated into three-layer bundles, surrounding the center pipe. Acharya et al, Prabhanjan, , Naphon and Wongwises, ,, Gupta et al, Guobing and Yufeng, and Naphon 78 have shown the application of coiled heat exchangers in various industrial applications (Figure ). 18 (a) U-tube heat exchanger, (b) U-tube double-pipe heat exchanger, and (c) coiled tube reactor …”
Section: Applications Of Coiled Tubesmentioning
confidence: 99%
“…In industrial applications, for example, the evaporators in refrigeration, forced convective evaporation is the dominant process and high heat-transfer efficiency can be obtained under smaller temperature difference between wall and liquid and compact geometries. Therefore, helical coiled tube finds a very good application in the refrigeration and cryogenics processes. ,,,− …”
The potential industrial applications of curved tubes for single- and two-phase flow are reviewed within the
context of physics of flow, trends in the development of technology, and its laboratory to industrial-scale
commercialization. Comparison of the performance of curved tube configurations demonstrates its edge over
the conventional motionless mixers, heat exchangers, and reactors. Alongside, their respective advantages
and limitations are also highlighted. Further, a compendium of the available correlations for single- and two-phase friction factor and heat- and mass-transfer coefficient in curved tubes has also been presented. Key
issues regarding the design parameters governing the performance of the curved tubes for mixing and heat-
and mass-transfer that impact the research, development, and scale-up or scale-down of such devices are also
analyzed. Emerging trends for the development of a new class of curved tubes, namely, inverters and serpentine
and chaotic devices are also presented.
“…Design and construction process for a coiled finned-tube heat exchanger is extensively discussed in [9][10][11]. The heat transfer surface areas (𝐴 𝑡,𝑆 : tube-side, and 𝐴 𝑆,𝑆 : shell-side) can be calculated following [12], and the tube-side and shell-side convective heat transfer coefficients (ℎ 𝑡 and ℎ 𝑆 respectively) can be found following [12,13]. Once these parameters are known, the net thermal rating (𝑈𝐴) of the heat exchanger is calculated using the following equation:…”
Section: Design and Analysis Of Cool-down Heat Exchangersmentioning
The Facility for Rare Isotope Beams (FRIB) is a continuous wave heavy ion beam linear accelerator designed for a maximum beam energy of 400 kW and using in-flight (fragment) production and separation to generate rare isotope beams. Spatial separation of the isotopes is achieved by using superconducting magnets with a high magnetic field, large aperture, and iron-dominated core. There are a total of 14 superconducting magnets used in the fragment separator section of the facility. Designs for these magnets are relatively new, and it poses challenges in several aspects of the cryogenic design and operation such as, compact coil and cryostat design, thermal shield design, and a controlled cool-down to the operating temperature while avoiding high thermal stresses. Helically coiled finned-tube cryogenic heat exchanger designs are considered for the controlled cool-down of superconducting magnets with up to 22.4 tonnes of cold mass. These heat exchangers use liquid nitrogen cooled helium gas to cool the superconducting magnets. They demonstrate high thermal effectiveness and mechanical flexibility that are essential for the variable operating temperatures (300 – 80 K) experienced during a cool-down process. This paper presents an overview of the process design, analysis, fabrication and operation of cool-down heat exchangers and their associated sub-systems developed at FRIB.
“…Choi [16] has experimented with thirty-four heat exchangers to investigate the heat transfer properties of discrete plate fins. Gupta et al [17][18][19] studied the refrigeration applications of coiled tube heat exchangers. Li et al [20] performed experiments to investigate the heat transfer enhancement in finned and micro-finned helical tubes.…”
The authors investigated four different fin geometries to select the best fin geometry in their previous work. They found out that the Nusselt number of the shell side is 80.79% higher for the stepped fin geometry compared to the simple annular fin at best. In this study, for the first time the heat transfer in a shell and helically coiled finned tube heat exchanger with stepped annular fins is investigated. The coiled tube and the stepped ring fins that are welded to the outside surface of the tube are all made of copper. After examining network independence, 27 cases were designed using Response Surface Methodology (RSM). Correlations have been proposed to predict Nuc$N{u}_c$ and Nush$N{u}_{sh}$ by considering all geometric and operating parameters. These correlations have very high accuracy and can be used in a specific range of parameters. The effect of each of the parameters on Nuc$N{u}_c$ and Nush$N{u}_{sh}$ are also specified. Re${\mathop{\rm Re}\nolimits} $ and Pr$\Pr $ are the parameters that have the most impact on the Nusselt number on the same side, but at the same time have almost no effect on the Nusselt number on the other side. Rec${{\mathop{\rm Re}\nolimits} }_c$ and Resh${{\mathop{\rm Re}\nolimits} }_{sh}$ have the highest participation rate in determining Nuc$N{u}_c$ and Nush$N{u}_{sh}$ with 82.62% and 71.13%, respectively. The results are presented based on dimensionless parameters. The optimization process is performed for each of the responses, and the values of the corresponding parameters are also shown. Nush$N{u}_{sh}$, which is the most critical response in this study, has improved 19.59% in the optimized case, even compared to the best of the 27 cases studied. To have the best overall heat performance of the heat exchanger, the optimization process has been performed.
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