Heat transfer and friction in trapezoidal channels with X-shaped ribs

Su, Weijie; Huang, Ting-Wei; Liu, Yao-Hsien

doi:10.1016/j.ijthermalsci.2021.106871

Cited by 9 publications

(11 citation statements)

References 26 publications

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“…Thermocouples were installed into the channel at equally spaced points to record the air temperatures, and the data were recorded by a thermocouple module (NI 9213, Texas, USA). The drawing of the trapezoidal cooling channel manufactured from polyvinyl chloride (PVC) is shown in Figure 2, which has been used in our previous publication [20]. It comprised an unheated entrance (105 mm), heated region (690 mm), and outlet section (103 mm).…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

“…These two heater elements were tightly fastened to the outer frame of the test section. More information can be found in our previously published paper [20]. The drawing of the trapezoidal cooling channel manufactured from polyvinyl chloride (PVC) is shown in Figure 2, which has been used in our previous publication [20].…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

“…More information can be found in our previously published paper [20]. The drawing of the trapezoidal cooling channel manufactured from polyvinyl chloride (PVC) is shown in Figure 2, which has been used in our previous publication [20]. It comprised an unheated entrance (105 mm), heated region (690 mm), and outlet section (103 mm).…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

“…These two heater elements were tightly fastened to the outer frame of the test section. More information can be found in our previously published paper [20].…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

“…Therefore, a novel X-shaped rib configuration was proposed, which can be considered as a combination between a V-shaped rib and an inverted V-shaped rib. For one single rib case, this X-shaped rib had better thermal performance than that of the V-shaped rib [20]. Since the repeated ribs were used instead of single rib for internal cooling passages, the two opposite walls in the trapezoidal channel were fully roughened with ribs for experimental investigation.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Performance of V-Shaped and X-Shaped Ribs in Trapezoidal Cooling Channels

Liu

2021

Energies

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Convective heat transfer enhancement using rib turbulators is effective for turbine blade internal cooling. Detailed heat transfer measurement of X-shaped ribs in a trapezoidal cooling channel was experimentally conducted using infrared thermography. The novel X-shaped ribs were designed by combining two V-shaped ribs, and more secondary flows generated by the X rib delivered higher heat transfer enhancement. The Reynolds numbers in this study were 10,000, 20,000, and 30,000. These ribs were installed on two opposite walls of a trapezoidal channel in a staggered arrangement. The rib pitch-to-height ratios were 10 and 20, and the rib height-to-hydraulic diameter ratio was 0.128. Results indicated that higher heat transfer distribution was observed in the vicinity of the shorter base in the trapezoidal channel. The full X-shaped ribs and the V-shaped ribs demonstrated the highest Nusselt number ratios among all the cases. Although full X-shaped ribs contributed to higher heat transfer improvement due to intensified secondary flows, they also caused significant pressure loss. Therefore, the cutback X-shaped ribs were proposed by removing a segment in the rib at either upstream or downstream region. Consequently, the upstream cutback X-shaped rib and the V-shaped rib produced the highest thermal performance in this trapezoidal channel.

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Section: Experimental Setup and Proceduresmentioning

confidence: 99%

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

“…These two heater elements were tightly fastened to the outer frame of the test section. More information can be found in our previously published paper [20].…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations