Heat transfer delay method for the fluid velocity evaluation in a multi-turn pulsating heat pipe

Pagliarini, Luca; Cattani, Luca; Mameli, Mauro; Filippeschi, Sauro; Bozzoli, Fabio

doi:10.1016/j.ijft.2022.100278

Cited by 7 publications

(2 citation statements)

References 31 publications

(66 reference statements)

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“…Heat transfer is the process of thermal energy transfer due to temperature difference in a medium or media (Chauhan et al, 2023;Cheng et al, 2023;Kolsi et al, 2023;Lin et al, 2023). Whenever temperature difference exists in a medium or between media, heat transfer is manifested (Pagliarini et al, 2023;Li et al, 2023). The various methods of heat transfer are conduction, radiation and convention (Rashid et al, 2022;Vijay et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Improving students’ performance and conceptual understanding of heat transfer using demonstration method

Awudi

Danso

2023

Journal of Mathematics and Science Teacher

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One of the physics topics difficult to understand among students at senior high schools (SHSs) is heat transfer. Various reasons have been advanced in an attempt to rationalize this difficulty. This study through an action research design was conducted to improve students’ performance and conceptual understanding of heat transfer at Oti Boateng Senior High School, Koforidua. The instruments used for the study were questionnaires, pre- and post-test. The study identified rote learning, inadequate understanding of concepts among others as the cause of difficulty in problem solving among students. The study revealed that although there are different methods of teaching, the efficacy of the demonstration method cannot be downplayed considering its role in improving students’ academic performance. The study concluded that for effective teaching and learning of heat transfer at SHS, it is important for teachers to employ the demonstration method in their teaching.

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Section: Introductionmentioning

confidence: 99%

Improving students’ performance and conceptual understanding of heat transfer using demonstration method

Awudi

Danso

2023

Journal of Mathematics and Science Teacher

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“…This is due to the fact that the PHPs operation is generally assessed from global characterizations, based on measurements over time of both evaporator and condenser temperatures [5]. A local evaluation of the fluid thermodynamics state is instead rarely achieved ( [6][7][8]) due to difficulties linked to sensors placement inside the fluid stream without increasing the set-ups complexity or perturbing the system [9]. On the other hand, devices having transparent inserts or windows might be investigated in terms of working fluid temperature by means of non-intrusive techniques, such as InfraRed (IR) thermography.…”

Section: Introductionmentioning

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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Experimental analyses of temperature and pressure oscillation frequencies of a flat plate pulsating heat pipe tested under various edge orientation angles and heat loads

Ayel,

Pagliarini,

Van’t Veer

et al. 2024

Exp. Comput. Multiph. Flow

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Heat transfer delay method for the fluid velocity evaluation in a multi-turn pulsating heat pipe

Cited by 7 publications

References 31 publications

Improving students’ performance and conceptual understanding of heat transfer using demonstration method

Improving students’ performance and conceptual understanding of heat transfer using demonstration method

Infrared measurements of fluid temperature in a polymeric Pulsating Heat Pipe

Experimental analyses of temperature and pressure oscillation frequencies of a flat plate pulsating heat pipe tested under various edge orientation angles and heat loads

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