Turbulent Opposing Mixed Convection Heat Transfer in a Vertical Flat Channel with One-Side Heating

Poěkas, Povilas; Poěkas, Robertas

doi:10.1080/01457630490276006

Cited by 8 publications

(10 citation statements)

References 7 publications

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“…( 19)) correlations. Experimental data are extracted from the P. Poskas and R. Poskas experiments [16].…”

Section: Discussionmentioning

confidence: 99%

“…To make the comparison among the experimental data easy, the authors study the relationships among the dependent parameters using the dependent parameter introduced in the Jackson and Fewster correlation, which has excellent predictivity as a representative parameter. Figure 10 shows the relationships between each dependent parameter adopted in each experiment (the vertical axes) and Jackson and Fewster's dependent parameter (the horizontal axes) for the sampling data provided in Section 3: (a) Herbert and Sterns [20], (b) Aicher and Martin [1], (c) Axcell and Hall [34], (d) Swanson and Catton (IJHMT) [15], (e) P. Poskas and R. Poskas [16], and (f) Takeshi et al [51]. The figures show strong correlations between Jackson and Fewster's and other dependent parameters.…”

Section: Discussionmentioning

confidence: 99%

“…( 30)) [15] Rectangular duct Freon-113 Gr b Re 2 6 b Pr 0 5 b + 1 P. Poskas and R. Poskas (Eq. ( 33)) [16] Rectangular duct Air Gr q Re 2 5 b Pr 0 9) was originally used to predict heat transfer coefficients for a vertical plate, the distance from the channel inlet is used as the characteristic length; however, Churchill used the pipe diameter as the characteristic length instead. This choice of characteristic length is also found in the thermal-hydraulic system code (Section 2.3).…”

Section: Ra = Gr Prmentioning

confidence: 99%

“…P. Poskas and R. Poskas. P. Poskas and R. Poskas [16] proposed an empirical correlation based on the experimental results in a rectangular duct whose only one side was heated under the UHF condition. The experimental apparatus was a rectangular duct with 6260 × 40 8 × 400 mm (length × gap × width), and the working fluid was air.…”

Section: Swanson and Catton (Ijhmt) Swanson And Cattonmentioning

confidence: 99%

“…The characteristic velocity and temperature difference were calculated based on randomly selected Re b and Gr b values from these ranges, and Figure 7 shows the calculation results. [16]. The working fluid used in the experiment was air, and one side of the rectangular duct was heated.…”

Section: Axcell and Hall's Experiment Axcell And Hallmentioning

confidence: 99%

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Opposing Mixed Convection Heat Transfer for Turbulent Single-Phase Flows

Motegi,

Sibamoto,

Hibiki

et al. 2024

International Journal of Energy Research

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Convection, wherein forced and natural convections are prominent, is known as mixed convection. Specifically, when a forced convection flow is downward, this flow is called opposing flow. The objectives of this study are to gain a comprehensive understanding of opposing flow mixed convection heat transfer and to establish the prediction methodology by evaluating existing correlations and models. Several heat transfer correlations have been reported related to single-phase opposing flow; however, these correlations are based on experiments conducted in various channel geometries, working fluids, and thermal flow parameter ranges. Because the definition of nondimensional parameters and their validated range confirmed by experiments differ for each correlation reported in previous studies, establishing a guideline for deciding which correlation should be selected based on its range of applicability and extrapolation performance is important. This study reviewed the existing heat transfer correlations for turbulent opposing flow mixed convection and the single-phase heat transfer correlations implemented in the thermal–hydraulic system codes. Furthermore, the authors evaluated the predictive performance of each correlation by comparing them with the experimental data obtained under various experimental conditions. The Jackson and Fewster, Churchill, and Swanson and Catton correlations can accurately predict all the experimental data. The effect of the difference in the thermal boundary conditions, i.e., uniform heat flux and uniform wall temperature, on the turbulent mixed convection heat transfer coefficient is not substantial. The authors confirmed that heat transfer correlations using the hydraulic-equivalent diameter as a characteristic length can be used for predictions regardless of channel-geometry differences. Furthermore, correlations described based on nondimensional dominant parameters can be used for predictions regardless of the differences in working fluids. The authors investigated the extrapolation performance of the mixed convection heat transfer correlations for a wide range of nondimensional parameters and observed that the Jackson and Fewster, Churchill, and Aicher and Martin correlations exhibit excellent extrapolation performance with respect to natural and forced convection flows, indicating that they can be applied beyond the parameter range validated experimentally.

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“…( 19)) correlations. Experimental data are extracted from the P. Poskas and R. Poskas experiments [16].…”

Section: Discussionmentioning

confidence: 99%