Characterization of polypropylene pulsating heat stripes: Effects of orientation, heat transfer fluid, and loop geometry

Der, Oguzhan; Alqahtani, Ali Ahmed; Marengo, Marco; Bertola, Volfango

doi:10.1016/j.applthermaleng.2020.116304

Cited by 26 publications

(17 citation statements)

References 21 publications

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“…A micro-metering valve, mounted on an aluminum clamp screwed on the PHP, is used for the filling/vacuuming procedure. For further details on the manufacturing processes, see [14].…”

Section: Experimental Set-upmentioning

confidence: 99%

Infrared measurements of fluid temperature in a polymeric Pulsating Heat Pipe

Pagliarini,

Clemens,

Bozzoli

et al. 2024

J. Phys.: Conf. Ser.

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Pulsating heat pipes are two-phase passive heat transfer devices partially filled with a working fluid in saturation conditions. During operation, supplying heat to one end of the system (named evaporator) results in a local increase in temperature and pressure, which drives the fluid through a transport section (named adiabatic section) towards the cooled, opposite end (named condenser) for effective heat dissipation. The local thermo-fluid dynamic state of the working fluid is sometimes assessed by means of non-intrusive techniques, such as infrared thermography. In this case, the radiative properties of the systems in the infrared spectrum must be known a priori. Nevertheless, since pulsating heat pipes may be manufactured with different materials, wall thicknesses and channel geometries, the radiative properties of the walls and the confined flow are not always known or assessable by means of the available literature. Hence, the work proposes to design a straightforward calibration procedure for quantitative infrared fluid temperature measurements in a polymeric pulsating heat pipe charged with FC-72 and having unknown radiative properties. The emissivity and transmissivity of the walls and confined fluid are estimated with good accuracy. The results will allow repeatable and reliable fluid temperature measurements in future experimentations on the mentioned device.

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“…A micro-metering valve, mounted on an aluminum clamp screwed on the PHP, is used for the filling/vacuuming procedure. For further details on the manufacturing processes, see [14].…”

Section: Experimental Set-upmentioning

confidence: 99%

Infrared measurements of fluid temperature in a polymeric Pulsating Heat Pipe

Pagliarini,

Clemens,

Bozzoli

et al. 2024

J. Phys.: Conf. Ser.

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“…To determine the fluid velocity, a wavelet analysis will be conducted [5] employing a complex Morlet wavelet. The rationale behind this selection is the resemblance between the wavelet shape and the signal profile [6]; a strong correlation between the two shapes leads to improved quality outcomes.…”

Section: δ𝑃 = 𝜌𝑔 ⃗ Cos(𝜃) + 𝑙(1 − 𝛼) ( 𝑓 𝑠 2𝑑 𝑖 𝜌 𝑙 𝑣 ⃗⃗⃗⃗)mentioning

confidence: 99%

“…This experiment focuses on exploring the thermal response of deployable PHP in microgravity conditions. Limited scientific literature addresses various flexible PHP devices, such as the flexible flat plate PHP, examined in different configurations, including a polycarbonate copper multi-layer structure [4] and a polypropylene semi-flat double sheet [5]. The latter, tested during the ESA 77th parabolic flight campaign, demonstrated promise.…”

Section: Introductionmentioning

confidence: 99%

The DEPLOY! Project: Development of a Deployable Pulsating Heat Pipe experiment on a parabolic flight

Billi,

Perna,

Picchi

et al. 2024

J. Phys.: Conf. Ser.

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DEPLOY! Project aims at analysing the behaviour of Deployable Pulsating Heat Pipe (PHP) shaped as a helicoidal torsional spring in the adiabatic section on board a Parabolic Flight platform. A PHP is a passive thermal control device where the heat is efficiently transported by means of the self-sustained oscillatory fluid motion driven by the phase change phenomena. The microgravity environment allows to eliminate the buoyancy force contribution in the liquid phase momentum. Consequently, it is possible to isolate the contribution of the pressure drop caused by the 3D arrangement and infer on their effect on the PHP performance. As a result, a proper design based on the previous considerations would increase the flexibility of the PHP for use in space applications without significant reductions in efficiency. The goal of DEPLOY! is to demonstrate the functionality of a Deployable Pulsating Heat Pipe in various unfolding configurations by analysing its thermal-hydraulic response throughout a Parabolic Flight. The presented Deployable PHP is composed of an aluminium tube (inner/outer diameters 1.6mm/2.6 mm) and filled with HFE-7000. It is heated at the evaporator using a flat heater and cooled at the condenser with a water-cooled cold plate. T-type thermocouples are used to measure the wall temperature in several locations, while two pressure transducers (one located in the evaporator section and another in the condenser section of the same pipe) measure the local fluid pressure. Additionally, an IR Camera will be used to observe a section of the pipe for further analysis of the flow frequency. The device operation will be tested on ground and 0-g at different heat loads (24W, 34W), in multiple static positions corresponding to different opening angles (0°, 45°, 90°, 135°, 180°) and during its dynamic opening from 0° to 180°, thanks to a remotely controllable motion system.

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“…The total interfacial area of bubbles decreases as they fuse on a surface or with another bubble. The paper presents the relationship between wettability and surface energy, which, according to the Young-Laplace equation, causes a decrease in capillary forces [27].…”

Section: Nanobubbles: Explanation and Propertiesmentioning

confidence: 99%

Review of Micro- and Nanobubble Technologies: Advancements in Theory and Applications and Perspectives on Adsorption Cooling and Desalination Systems

Lasek,

Krzywanski,

Skrobek

et al. 2023

Energies

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Adsorption refrigerators are a compelling ecological alternative to compressor refrigerators; global warming forces us to constantly look for alternative sources of energy and cold. Cold production in adsorption chillers is based on the use of heat generated by other processes running in the company. Waste heat from production processes, which has, until now, been irretrievably lost, is a potential source of energy for generating cold via an adsorption unit producing chilled water. Cooling optimizes the use of the heating network in summer and can lead to increased electricity production while reducing heat supply losses. Thus far, attempts to implement adsorption refrigerators for widespread use have not been successful as a result of the low efficiency of these devices; this is directly related to the poor heat and mass transfer conditions in the beds and heat exchangers of adsorption refrigerators. The solutions used so far, such as new working pairs, glued beds or modifications to the structure or cycle length, are still not strong enough for these devices. Therefore, it is necessary to look for new solutions. Using micro- and nanobubbles as media to increase mass and heat transfer in refrigerators is an innovative and pioneering solution. Thus, this document describes the most important features of micro- and nanobubble technology applications in adsorption refrigerators. This article is an introduction and a basis for the implementation of further research, consolidating the existing literature as a review.

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Characterization of polypropylene pulsating heat stripes: Effects of orientation, heat transfer fluid, and loop geometry

Cited by 26 publications

References 21 publications

Infrared measurements of fluid temperature in a polymeric Pulsating Heat Pipe

Infrared measurements of fluid temperature in a polymeric Pulsating Heat Pipe

The DEPLOY! Project: Development of a Deployable Pulsating Heat Pipe experiment on a parabolic flight

Review of Micro- and Nanobubble Technologies: Advancements in Theory and Applications and Perspectives on Adsorption Cooling and Desalination Systems

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