Variations of forced convection heat transfer of packed beds according to the heated sphere position and bed height

Lee, Dong-Young; Chung, Bum-Jin

doi:10.1016/j.icheatmasstransfer.2019.02.004

Cited by 19 publications

(11 citation statements)

References 23 publications

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“…The mathematical models to describe the heat and mass transfer respectively are in the same form, making it appropriate to obtain an analogy between the two types of phenomenon 61,62 . Table 4 compared the non‐dimensional parameters between the heat and mass transfer systems 61 .…”

Section: Convective Heat Transfer Characteristics In the Packed Pebble Bedmentioning

confidence: 99%

“…Through measuring the mass transfer coefficients, the heat transfer coefficients can be achieved indirectly based on the analogy method. Lee and Chung adopted the electroplating system with the solution of the cooper sulfate and sulfuric acid as the mass transfer system, which is shown in Figure 11 62 . Heat transfer between the fluid and pebble surface is analogous to the transfer process of cupric ions from the anode to the cathode, which can be evaluated through measuring the electric current.…”

Section: Convective Heat Transfer Characteristics In the Packed Pebble Bedmentioning

confidence: 99%

“…Experimental setup using the analogy method 62 [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Convective Heat Transfer Characteristics In the Packed Pebble Bedmentioning

confidence: 99%

“…The above method based on the electroplating system can help get rid of the difficulty in measuring the pebble surface and fluid temperatures and eliminate the cost in the measurement 61,62 …”

Section: Convective Heat Transfer Characteristics In the Packed Pebble Bedmentioning

confidence: 99%

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Review of the experimental research on the thermal‐hydraulic characteristics in the pebble bed nuclear reactor core and fusion breeder blankets

et al. 2020

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Summary Merits in the inherent safety characteristics and multiple applications, cause the pebble‐bed‐type nuclear reactors, including the High‐Temperature Gas‐cooled Reactors, Fluoride‐salt‐cooled High‐temperature Reactors and Water‐cooled Pebble‐bed Reactors, to gain more focus in recent years. Thermal‐hydraulic characteristics in the pebble bed reactor core are of great significance to the safety evaluation and design of such reactors. Experimental investigations on the thermal‐hydraulics of different fluids in the pebble‐bed‐type of nuclear reactor core have been reviewed in this paper. Main experimental methods to determine the flow regime transition, convective heat transfer coefficients, and effective thermal conductivity have been summarized, with the merits and disadvantages discussed. Discussions are given on the main factors that can influence the flow, convective heat transfer and effective thermal conductivity in the pebble bed.

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Section: Convective Heat Transfer Characteristics In the Packed Pebble Bedmentioning

confidence: 99%

Section: Convective Heat Transfer Characteristics In the Packed Pebble Bedmentioning

confidence: 99%

“…Experimental setup using the analogy method 62 [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Convective Heat Transfer Characteristics In the Packed Pebble Bedmentioning

confidence: 99%

Section: Convective Heat Transfer Characteristics In the Packed Pebble Bedmentioning

confidence: 99%

See 2 more Smart Citations

Review of the experimental research on the thermal‐hydraulic characteristics in the pebble bed nuclear reactor core and fusion breeder blankets

et al. 2020

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“…Lee and Chung [6] were conducted the effect of axial and radial location of one heated bead at unheated porous pads and with whole heated beads in porous beds experimentally. Porous beds height varying from 0.02m to 0.26m and particle Reynolds number was varying 31-389.…”

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confidence: 99%

Convection Heat Transfer Analysis in A Vertical Porous Tube

Abdulkareem

Hilal

2020

ejuow

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Forced convective heat transfer in a vertical channel symmetrically heated with a constant heat flux, and packed with saturated porous media, has been investigated experimentally in the present work. The channel was padded with spherical glass of three diameter (1, 3 and 10 mm) in a range 0.0416 < (particle diameter / inner channel radius) <0.416. The experimental setup, using a copper tube as a packed bed assembly with (48 mm) inside diameter and (1150 mm) heated length with a constant heat flux boundary condition. The test section was vertically oriented with water flowing against gravity and packed with glass spheres (1, 3 and 10 mm) diameter respectively. The results show that local Nusselt number increased at 34% with increasing Reynolds number at 65% while increased at 11% with increasing heat flux at 71%. Heat transfer rate increase as the particle diameter increase at the range of (1 – 3) mm but decrease with increasing particle diameter at the range (3 – 10) mm. Pressure drop through channel minimize at 97% as porosity increase at 23%.Many empirical relations, obtained experimentally.

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Anode influence on the electrochemical realization of packed bed heat transfer

2021

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Anode influence on the electroplating system was investigated when natural convection heat transfer in a packed bed is simulated by mass transfer based on the analogy. The cathode to anode area ratio (A c /A a ) was varied from 1 to 50. For three different anode positions of top and bottom of test section and corner of acryl tank, the distance of anode to cathode bed was varied: 0.01, 0.03, 0.07 m in all heating spheres experiments. The sphere diameter was 0.006 m, which corresponds to Ra d of 1.83×10 7 . The duct diameter was 0.06 m and bed height was 0.025 m. The Sc corresponding to the Pr was 2014. The verification test result for a single heating sphere in unheated packed bed agreed well with the extrapolated correlation of Achenbach (1995). The anode influence experiments for all heating spheres showed that the limitation of the area ratio is about 20. The desirable positions of anode are the bottom of test section and corner of the acryl tank, regardless of the distance between the anode and cathode packed bed.

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Variations of forced convection heat transfer of packed beds according to the heated sphere position and bed height

Cited by 19 publications

References 23 publications

Review of the experimental research on the thermal‐hydraulic characteristics in the pebble bed nuclear reactor core and fusion breeder blankets

Review of the experimental research on the thermal‐hydraulic characteristics in the pebble bed nuclear reactor core and fusion breeder blankets

Convection Heat Transfer Analysis in A Vertical Porous Tube

Anode influence on the electrochemical realization of packed bed heat transfer

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