An experimental investigation of thermal performance of pulsating heat pipe with alcohols and surfactant solutions

Bastakoti, Durga; Zhang, Hongna; Cai, Weihua; Li, Feng-Chen

doi:10.1016/j.ijheatmasstransfer.2017.10.075

Cited by 65 publications

(12 citation statements)

References 23 publications

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“…The heat pipe with different materials and tilt angles were analysed with the wick of the heat pipe were reported [11][12]. Heat pipe with various working fluids and filling ratios were investigated for various applications revealed in [13][14]. Işık et al [15] fabricated a heat pipe using ammonia.…”

Section: Revised Manuscript Received On December 5 2019mentioning

confidence: 99%

Heat transfer Augmentation of Gravity Assisted Multi Heat pipe Induced Heat Exchanger

Kumar¹,

Sivasubramanian²,

Kanna³

et al. 2019

IJEAT

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Heat transfer augmentation of a heat exchanger with a multi-heat pipe has been investigated with the influence of gravity assistance. The working fluids used to analyse the performance are methanol and acetone. Water is used as a heat transfer fluid. In which, the analysis is carried out with the gravity-assisted angles of 0º, 45º and 90º. In this work, various parameters such as temperatures of hot water ranges 50ºC, 60ºC, 70ºC, and cold water temperature are observed as 32.5ºC throughout the investigation. Hot water mass flow rates as 40 LPH to 120 LPH with an increase of 20 LPH, cold water as 20 LPH to 60 LPH with an increase of 10 LPH. The result reveals that increase in effectiveness occurs at an angle of 0º for Acetone with 60ºC and 100 LPH is 71.5% of an increase in effectiveness is achieved than methanol for optimum said conditions.

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Section: Revised Manuscript Received On December 5 2019mentioning

confidence: 99%

Heat transfer Augmentation of Gravity Assisted Multi Heat pipe Induced Heat Exchanger

Kumar¹,

Sivasubramanian²,

Kanna³

et al. 2019

IJEAT

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“…The heat energy is directly delivered by the oscillation motion of working fluids in PHP. The thermal performance of PHP varied from different parameters, which are the operation parameters (eg, inclination angle and filled ratio), 10,11 thermodynamics parameters (eg, working fluids and surfactant solution), 12‐24 and geometric parameters (eg, cross‐section shape, inner diameter, turns, and heat pipe materials) 25‐29 . Especially, it is much more worth to further discuss the effect of thermodynamic parameters on the heat transfer mechanism of PHP.…”

Section: Introductionmentioning

confidence: 99%

“…Their results indicatethat the PHP could be much easier to start‐up when the working fluids with lower boiling point. In addition, Bastakoti et al 22 reports that the lower viscosity and surface tension are helpful for the start‐up of PHP at lower filled ratio and heat load. The specific heat capacity and latent heat play dominant roles in the thermal resistance.…”

Section: Introductionmentioning

confidence: 99%

Effect of ultrasonic on the enhancement of heat transfer for pulsating heat pipe

Zhang

Jiang

et al. 2021

Int J Energy Res

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Summary The pulsating heat pipe (PHP) has become one of the most promising devices to dramatically remove heat for electronic devices. This work focuses on the experimental investigation of ultrasonic on the enhancement of heat transfer of PHP, and further discusses this effect at the different working fluids. The results indicate that the external region of PHP exhibits more intense oscillation motion of working fluids than that of internal‐region. The heat transfer performance enhanced assisted with the ultrasonic at the heating power of 5 to 20 W but deteriorated at 25 W. For details, the heat transfer coefficient (HTC) increased 72.6%, and the internal and external start‐up times reduced 57.8% and 2.2%, respectively. Furthermore, the numerous vapors confirm that the ultrasonic cavitation would effectively accelerate the phase transition. Finally, it also discusses the couple effect between the ultrasonic and different working fluids on heat transfer coefficient. The maximum HTC of 1.85 is obtained at the heating power of 15 W for the PHP charged with acetone. In addition, the trend of HTC of PHP filled with acetone shows much more stable assisted with ultrasonic varying from the heating power inputs. Highlights The thermal performance was revealed by internal and external region of PHP The directly enhanced method of ultrasonic cavitation was introduced The novel index of the heat transfer coefficient (HTC) was proposed The couple effect ultrasonic on the enhancement of heat transfer was discussed with different working fluids

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“…The lower surface tension of CTAC resolution is believed to be the rationale behind the yielding of better thermal performance of PHP at completely different operational conditions compared to de-ionized (DI) water. However, that experimental set-up lacked the visualization facility (Bastakoti et al, 2018a).…”

Section: Introductionmentioning

confidence: 99%

Visualization of bubble mechanism of pulsating heat pipe with conventional working fluids and surfactant solution

Basatakoti

Zhang

et al. 2019

Exp. Comput. Multiph. Flow

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Visualization experiment is a must in realizing functional characteristics of an operational pulsating heat pipe (PHP). So far there is no general formulation which can foretell the complex and chaotic flow nature for every working fluid. Different response of working fluids and their distinct flow nature as well as their behavior can be visualized which thereby helps to understand the operational mechanism of the PHP. In this experiment, tests were conducted in a transparent PHP with 3 conventional working fluids, viz. de-ionized (DI) water, methanol, ethanol, and 300 ppm cetyltrimethyl ammonium chloride (CTAC) solution, each with fill ratio (FR) of 50%. With the help of high speed camera, flow characteristics at different operational stages for each working fluid are captured. Difference in the generation, growth, movement, and flow direction of bubbles are observed and the consequence of combined effects of various thermal properties of the fluid rather than a dominating single property. Start-up characteristics and dominating flow pattern for each fluid are reported in this paper. Moreover, peculiar flow characteristics with 300 ppm CTAC like bubble detachment, movement of cluster of micro-bubbles, and swirling are also presented.

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An experimental investigation of thermal performance of pulsating heat pipe with alcohols and surfactant solutions

Cited by 65 publications

References 23 publications

Heat transfer Augmentation of Gravity Assisted Multi Heat pipe Induced Heat Exchanger

Heat transfer Augmentation of Gravity Assisted Multi Heat pipe Induced Heat Exchanger

Effect of ultrasonic on the enhancement of heat transfer for pulsating heat pipe

Visualization of bubble mechanism of pulsating heat pipe with conventional working fluids and surfactant solution

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