Experimental Observation of Natural Convection Heat Transfer Performance of a Rectangular Thermosyphon

Huang, Chao; Yu, Chia Wang; Chen, R. H.; Tzeng, Chun Ta; Lai, Chi Ming

doi:10.3390/en12091702

Cited by 6 publications

(6 citation statements)

References 16 publications

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“…Huang et al [9] also presented an experimental study on the natural convection heat transfer performance of a rectangular thermosiphon with an aspect ratio of 3.5 and an inner diameter of the loop of 11 mm. Different heating powers, height differences between the heating and cooling ends, and cold end temperatures were tested.…”

Section: Smart Materials and Renewable Energy In Building Envelopementioning

confidence: 99%

Special Issue “Building Thermal Envelope”

Brito

Gomes

2020

Energies

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Section: Smart Materials and Renewable Energy In Building Envelopementioning

confidence: 99%

Special Issue “Building Thermal Envelope”

Brito

Gomes

2020

Energies

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“…Many other geometrical configurations were studied, e.g., coaxial cylinders [19], porous media [20], thermosyphons [21,22] as well as forced thermo-magnetic convection [23]. A new topic in the field started in the 2000s concerning nano-fluids with magnetic properties and their behavior under the influence of the strong magnetic field [24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

An Analysis of a Laminar-Turbulent Transition and Thermal Plumes Behavior in a Paramagnetic Fluid Subjected to an External Magnetic Field

Kraszewska

Donizak

2021

Energies

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Transition to turbulence and changes in the fluid flow structure are subjects of continuous analysis and research, especially for unique fields of research such as the thermo-magnetic convection of weakly magnetic fluids. Therefore, an experimental and numerical research of the influence of an external magnetic field on a natural convection’s fluid flow was conducted in the presented research. The experimental part was performed for an enclosure with a 0.5 aspect ratio, which was filled with a paramagnetic fluid and placed in a superconducting magnet in a position granting the enhancement of the flow. The process was recorded as temperature signals from the thermocouples placed in the analyzed fluid. The numerical research enabled an investigation based not only on temperature, but velocities as well. Experimental and numerical data were analyzed with the application of extended fast Fourier transform and wavelet analysis. The obtained results allowed the determination of changes in the nature of the flow and visualization of the influence of an imposed strong magnetic field on a magnetic fluid. It is proved that an applied magnetic field actuates the flow in Rayleigh-Benard convection and causes the change from laminar to turbulent flow for fairly low magnetic field inductions (2T and 3T for ΔT = 5 and 11 °C respectively). Fast Fourier transform allowed the definition of characteristic frequencies for oscillatory states in the flow, as well as an observation that the high values of magnetic field elongate the inertial range of the flow on the power spectrum density. Temperature maps obtained during numerical simulations granted visualizations of thermal plume formation and behavior with increasing magnetic field.

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“…Experimentally, a natural convection heat transfer 34 was investigated to test its effects on the efficiency of a rectangular thermosyphon with an aspect ratio (length/width) of 3.5. The experimental model is divided into a loop structure, a heating section, a cooling section, and two adiabatic sections.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of closed‐loop thermosyphon with a different evaporator geometry

2020

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In this study, the effect of evaporator geometry on the loop thermosyphon's heat transfer coefficient is experimentally verified by using water as a working fluid with three filling ratios (50%, 70%, 90%), constant heat input (185 W), and condenser cooling water flow rate remaining constant at 2 Lpm. Three evaporator pipes are used (I: straight; II: helical coil evaporator with a diameter of 100-mm coil and two turns; III: helical coil evaporator with a diameter of 50-mm coil and four turns). From the experimental results, it can be observed that the performance of evaporator III is higher than the two other forms. A greater heat transfer coefficient value is found in case of type III evaporator and is equivalent to 2456 W/m 2 •°C. The maximum thermal resistance reduction occurs in the type III evaporator (37.32%), and the highest effective thermal conductivity for the same type is 6.123e + 05 W/m•°C. The experimental results demonstrate good agreement with the empirical equations.

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Experimental Observation of Natural Convection Heat Transfer Performance of a Rectangular Thermosyphon

Cited by 6 publications

References 16 publications

Special Issue “Building Thermal Envelope”

Special Issue “Building Thermal Envelope”

An Analysis of a Laminar-Turbulent Transition and Thermal Plumes Behavior in a Paramagnetic Fluid Subjected to an External Magnetic Field

Experimental study of closed‐loop thermosyphon with a different evaporator geometry

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