Experimental and numerical study on pressure drop and heat transfer performance of grille-sphere composite structured packed bed

Wang, Jingyu; Yang, Jian; Cheng, Zhilong; Liu, Yan; Chen, Yitung; Wang, Qiuwang

doi:10.1016/j.apenergy.2017.07.140

Cited by 50 publications

(16 citation statements)

References 35 publications

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“…An average deviation of 3.94% and 0.43% for the friction factor and Nusselt number, respectively, indicates the reliability of the present method. Detailed information of this part can also be found in our previous study [19], which is not going to be repeated here.…”

Section: Numerical Methods Validationmentioning

confidence: 99%

“…The maximal element size near the particle surface of 1/75 d p is adopted ultimately due to insignificant variations of the Nusselt number and friction factor. The details of the grid independence test can be found in our previous study [19].…”

Section: Mesh Sensitive Studymentioning

confidence: 99%

“…They found that the local and macroscopic characteristics of the structured packed beds with different packing configurations behave in quite a different way. Wang et al [19] carried out porescale simulations to study the velocity and temperature profiles in both simple cubic (SC) packing and the grille-sphere composite packed bed (GSCPB). The mechanism of heat transfer enhancement in GSCPB was revealed.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Assessment of flow pattern and temperature profiles by residence time distribution in typical structured packed beds

Wang

Yang

Sundén

et al. 2020

Numerical Heat Transfer, Part A: Applications

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The flow and temperature fields in packed beds are rather complex but are of great importance since they will influence macroscopic parameters and the overall performance of the packed bed system. Regions with either too high or too low velocity are not preferred since they will decrease the heat and mass transfer characteristics of packed beds. The residence time distribution (RTD) is a way to assess the characteristics of the flow maldistribution, where a narrower distribution is closer to the ideal plug flow with less dispersion. In this article, the RTD in three typical structured packed beds, namely, the simple cubic (SC) packing, the body-centered cubic (BCC) packing and the facecentered cubic (FCC) packing, are studied by using ANSYS FLUENT. Results show that, firstly, the RTD curve can be used to diagnose the flow pattern in packed beds where the skewed peak indicates the channeling effect and a long tail relates to recirculation. It is revealed secondly that, FCC packing has the narrowest RTD curve in the studied structures, BCC packing comes second and SC packing has the flattest RTD curve, which demonstrates that the flow uniformity in FCC packing is the best. For the same packing form, the flow is less maldistributed at higher velocity. Finally, it is shown that the packing form with less dispersion, which behaves more like the ideal plug flow, has a more uniform distribution of the particle-to-fluid heat transfer coefficient near the particle surface.

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Section: Numerical Methods Validationmentioning

confidence: 99%

Section: Mesh Sensitive Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Assessment of flow pattern and temperature profiles by residence time distribution in typical structured packed beds

Wang

Yang

Sundén

et al. 2020

Numerical Heat Transfer, Part A: Applications

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“…In our group, Yang et al [7] investigated flow and forced convective heat transfer in structured packed beds with spherical or ellipsoidal particles with symmetry boundary conditions. Wang et al [8] designed a grille-sphere composite structured packed bed (GSCSPB), aiming to achieve the SC structured packing configuration easily, which is similar to N = 1.00 packing form, as shown in Figure 1b. Pressure drop and heat transfer performance of GSCSPB have been experimentally and numerically studied.…”

Section: Introductionmentioning

confidence: 99%

“…Figure 1. Schematic of (a) composite structured packing (CSP) by Calis et al [3] and Rokmes et al [4]; and (b) grille-sphere composite structured packed bed (GSCSPB) by Wang et al [8].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Flow and Heat Transfer in Structured Packed Beds with Smooth or Dimpled Spheres at Low Channel to Particle Diameter Ratio

Zhou

Yang

et al. 2018

Energies

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Packed beds are widely used in catalytic reactors or nuclear reactors. Reducing the pressure drop and improving the heat transfer performance of a packed bed is a common research aim. The dimpled structure has a complex influence on the flow and heat transfer characteristics. In the present study, the flow and heat transfer characteristics in structured packed beds with smooth or dimpled spheres are numerically investigated, where two different low channel to particle diameter ratios (N = 1.00 and N = 1.15) are considered. The pressure drop and the Nusselt number are obtained. The results show that, for N = 1.00, compared with the structured packed bed with smooth spheres, the structured packed bed with dimpled spheres has a lower pressure drop and little higher Nusselt number at 1500 < ReH < 14,000, exhibiting an improved overall heat transfer performance. However, for N = 1.15, the structured packed bed with dimpled spheres shows a much higher pressure drop, which dominantly affects the overall heat transfer performance, causing it to be weaker. Comparing the different channel to particle diameter ratios, we find that different configurations can result in: (i) completely different drag reduction effect; and (ii) relatively less influence on heat transfer enhancement.

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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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Experimental and numerical study on pressure drop and heat transfer performance of grille-sphere composite structured packed bed

Cited by 50 publications

References 35 publications

Assessment of flow pattern and temperature profiles by residence time distribution in typical structured packed beds

Assessment of flow pattern and temperature profiles by residence time distribution in typical structured packed beds

Numerical Simulation of Flow and Heat Transfer in Structured Packed Beds with Smooth or Dimpled Spheres at Low Channel to Particle Diameter Ratio

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

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