Numerical and experimental study of the heat transfer process in a double pipe heat exchanger with inner corrugated tubes

Córcoles, J.I.; Moya-Rico, J.D.; Molina, A.E.; Almendros-Ibáñez, J.A.

doi:10.1016/j.ijthermalsci.2020.106526

Cited by 64 publications

(15 citation statements)

References 48 publications

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“…Furthermore, the literature survey revealed that numerical investigations on the corrugated tubes were mainly carried out under turbulent flow conditions with Re > 5000; see e.g. [13,16,17,18]. Hence, the present study contributes to close the experimental and numerical research gap on the heat transfer and pressure drop characteristics in the transitional flow regime for corrugated tubes with low internal diameter (4.5 mm).…”

Section: Introductionmentioning

confidence: 68%

Experimental and numerical characterization of single-phase pressure drop and heat transfer enhancement in helical corrugated tubes

Cruz,

Mendes,

Pereira

et al. 2021

Preprint

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The internal flow in corrugated tubes of different helical pitch, covering from the laminar to turbulent regime, was studied in order to characterize the three-dimensional flow and the influence of corrugation geometry on pressure drop and convective heat transfer. With water as working fluid and an imposed wall heat flux, ranging from around 4 to 33 kW/m 2 , a numerical model was developed with a CFD commercial software, where k − ω SST was used to model turbulence. Experimental tests were performed covering Reynolds numbers in the range from around 300 up to 5000, which allowed to identify the transition region and validate the numerical model. The results show that due to the swirl induced by the corrugation, the critical Reynolds number for the start of transition to turbulent flow is reduced. The thermal performance factor, which quantifies the heat transfer enhancement at the expense of pressure drop, was used to compare the corrugated tubes against the reference case of smooth tube. Based on this, all investigated corrugated geometries performed better than the smooth tube, except for low Reynolds numbers (Re < 500) in the laminar regime.Overall, the corrugated tube with the lowest pitch showed a clearly better performance for the intermediate range of Reynolds numbers (1000 < Re < 2300), being an optimal choice for a wider range of operating conditions in the transitional and turbulent flow regimes.

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Section: Introductionmentioning

confidence: 68%

Experimental and numerical characterization of single-phase pressure drop and heat transfer enhancement in helical corrugated tubes

Cruz,

Mendes,

Pereira

et al. 2021

Preprint

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“…Also, they defined a good criterion, thermal performance enhancement factor, for the selection of the optimum turbulator and their parameters by investigating the thermal and hydraulic performance of the tube with groove and rib. Córcoles et al 32 validated the numerical model with the experimental setup in investigating inner corrugated tubes, and a good agreement was obtained. Besides, they exhibited the impact of severity index or CSF on heat transfer and flow performances.…”

Section: Introductionmentioning

confidence: 83%

Effect of outline curvature degree on heat transfer and flow characteristics inside dimpled tubes and spirally grooved tubes

2021

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The flow behaviors and heat transfer characteristics have been studied inside the dimpled tubes and spirally grooved tubes with different curvature degrees, which is considered for the first time within the influence factors. A three‐dimensional numerical simulation by periodic boundary conditions is performed to model the fully developed flow of dimpled and grooved sections to acquire the finer mesh and more accurate results. In addition, the dimple and groove outlines with different curvature degrees are generated by polynomial functions. Effects of curvature degrees for dimpled tubes and spirally grooved tubes on flow, heat transfer, and comprehensive performances are discussed. The results indicate that the influence of curvature degrees for dimpled tubes exhibit an opposite behavior when compared with those for spirally grooved tubes. On the whole, all performance factors increase with the growing curvature degree for dimpled tubes but decrease with the increasing curvature degree for spirally grooved tubes. By comparing different curvature degrees, the maximum ranges of heat transfer enhancement are 1.50–2.22 and 2.54–2.82, respectively, for dimpled and grooved tubes with respect to Re. Thermal and hydraulic fields are considered to analyze the mechanism of heat transfer enhancement. The analysis shows that the way the dimple changes thermohydraulic properties differs from the way the groove changes the properties.

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“…where m k k w eff w = 64 / ( ) , w represents the channel width, k w is the solid thermal conductivity, and T w denotes the solid wall temperature. The more detailed description for the principle of micro-groove heat pipes can be found in previous research studies [21] and [22].…”

Section: The Working Principle Of Micro-groove Heat Pipementioning

confidence: 99%

Plough-extrusion Forming for Making Micro-groove Heat Pipes on Hydrostatic Thrust Bearings of Heavy Machinery

Zhe

Li³

et al. 2020

SV-JME

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The present paper focuses on the manufacturing of micro-groove heat pipes on hydrostatic thrust bearings of heavy machinery. Special multitooth tools were designed for plough-extrusion forming heat pipes on flat copper. Experimental results were conducted to determine whether the plough-extrusion forming could achieve better performance than traditional wire electrical discharge. Furthermore, the processing using multi-tooth tool with 10 mm length, 55 tooth number, 0.25 mm tooth depth and 0.22 tooth top width was found to achieve the best performance among the six optional tools. The 50 mm/min forming speed was determined to acquire the best surface quality of the microgroove structure. Through heat transfer testing, the theoretical model for a micro-groove heat pipe made by plough-extrusion forming was also verified.

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Numerical and experimental study of the heat transfer process in a double pipe heat exchanger with inner corrugated tubes

Cited by 64 publications

References 48 publications

Experimental and numerical characterization of single-phase pressure drop and heat transfer enhancement in helical corrugated tubes

Experimental and numerical characterization of single-phase pressure drop and heat transfer enhancement in helical corrugated tubes

Effect of outline curvature degree on heat transfer and flow characteristics inside dimpled tubes and spirally grooved tubes

Plough-extrusion Forming for Making Micro-groove Heat Pipes on Hydrostatic Thrust Bearings of Heavy Machinery

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