Thermal performance comparison of flat plate pulsating heat pipes of different material thermal conductivity using ethanol-water mixtures

Kumar Malla, Laxman; Vempeny, Davis T.; Dileep, Hemanth; Dhanalakota, Praveen; Sinha Mahapatra, Pallab; Srivastava, Pankaj; Pattamatta, Arvind

doi:10.1016/j.applthermaleng.2023.121475

Cited by 3 publications

(2 citation statements)

References 36 publications

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“…The FPPHP’s closed-loop channels are partially filled with a working fluid, and the formation of multiple vapor plugs and liquid slugs and their oscillation can be observed. The dynamic behavior of the liquid–vapor interface between the liquid slug and vapor plug is influenced by the external heat load, filling ratio, working fluid, and so on. , Instead of using wicking structures to transport working fluid, thermosyphons can transport liquid from the condenser section to the evaporator section using gravity force (Figure c), and this technology eliminates the use of wicking structures in cooling devices. Recent research indicates that by modifying the wettability of surfaces, the thermal performance of FPPHPs and thermosyphons ,, can be enhanced.…”

Section: Applicationsmentioning

confidence: 99%

Fundamentals and Applications of Surface Wetting

Josyula,

Kumar Malla,

Thomas

et al. 2024

Langmuir

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In an era defined by an insatiable thirst for sustainable energy solutions, responsible water management, and cutting-edge lab-on-a-chip diagnostics, surface wettability plays a pivotal role in these fields. The seamless integration of fundamental research and the following demonstration of applications on these groundbreaking technologies hinges on manipulating fluid through surface wettability, significantly optimizing performance, enhancing efficiency, and advancing overall sustainability. This Review explores the behavior of liquids when they engage with engineered surfaces, delving into the farreaching implications of these interactions in various applications. Specifically, we explore surface wetting, dissecting it into three distinctive facets. First, we delve into the fundamental principles that underpin surface wetting. Next, we navigate the intricate liquid−surface interactions, unraveling the complex interplay of various fluid dynamics, as well as heat-and mass-transport mechanisms. Finally, we report on the practical realm, where we scrutinize the myriad applications of these principles in everyday processes and real-world scenarios.

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Section: Applicationsmentioning

confidence: 99%

Fundamentals and Applications of Surface Wetting

Josyula,

Kumar Malla,

Thomas

et al. 2024

Langmuir

Self Cite

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“…With the constant advancement of electronic components toward miniaturization and high power, thermal management has become a research hotspot currently [ 1 , 2 , 3 ]. As a key element of thermal management, heat dissipation technology has attracted a great deal of attention [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Performance of a 3D-Printed Aluminum Flat-Plate Oscillating Heat Pipe Finned Radiator

Xiao,

He,

Wang

et al. 2023

Nanomaterials

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As electronic components progressively downsize and their power intensifies, thermal management has emerged as a paramount challenge. This study presents a novel, high-efficiency finned heat exchanger, termed Flat-Plate Oscillating Heat Pipe Finned Radiator (FOHPFR), which employs arrayed flat-plate oscillating heat pipes (OHP) as heat dissipation fins. Three-dimensional (3D)-printed techniques allow the internal microchannels of the FOHPFR to become rougher, providing excellent surface wettability and capillary forces, which in turn significantly improves the device’s ability to dissipate heat. In this study, the 3D-printed FOHPFR is compared with traditional solid finned radiators made of identical materials and designs. The impacts of filling ratio, inclination angle, and cold-end conditions on the heat transfer performance of the 3D-printed FOHPFR are investigated. It is demonstrated by the results that compared to solid finned radiators, the FOHPFR exhibits superior transient heat absorption and steady-state heat transfer capabilities. When the heating power is set at 140 W, a decrease in thermal resistance from 0.32 °C/W in the solid type to 0.11 °C/W is observed in the FOHPFR, marking a reduction of 65.6%. Similarly, a drop in the average temperature of the heat source from 160 °C in the solid version to 125 °C, a decrease of 21.8%, is noted. An optimal filling ratio of 50% was identified for the vertical 3D-printed FOHPFR, with the minimal thermal resistance achieving 0.11 °C/W. Moreover, the thermal resistance of the 3D-printed FOHPFR is effectively reduced compared to that of the solid finned radiator at all inclination angles. This indicates that the FOHPFR possessed notable adaptability to various working angles.

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A comprehensive assessment of working fluids selection in heat pipe-assisted battery thermal management systems: An integrated Multi-criteria decision-making approach

Kumar,

Dwivedi,

Sethi

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part A:

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Heat pipes are becoming increasingly popular for managing thermal conditions of electric car battery packs because of their durability, superconductive ability, low maintenance requirements, and lifespan. In this work, suitable working fluid for heat pipes has been identified using multi-criteria decision-making (MCDM) methods for 15 working fluids (Helium, Hydrogen, Oxygen, Nitrogen, Propane, Ethane, Ethanol, R123, Methanol, Toluene, Acetone, (FC-72), Ammonia, (HFE-7000), and water) as potential alternatives and nine decision attributes (thermal conductivity, specific heat capacity, compatibility with heat pipe material, phase change temperature, latent heat of vaporization (LHV), density, viscosity, surface tension, and cost). The criteria weights determined by Criteria importance through inter-criteria correlation (CRITIC) and analytical hierarchy process (AHP) schemes were utilized to prioritize considered working fluids through the application of Multi-Objective Optimization basis on Ratio Analysis (MOORA), Preference ranking organization method for enrichment evaluation (PROMETHEE) and weighted aggregated sum product assessment technique (WASPAS) ranking methods. The findings indicated that water is the best alternative, followed by ammonia. Cost emerged as the most convincing criterion, followed by the compatibility of heat pipe material. The qualitative analysis showed that the integrated weight-based PROMETHEE-II method is the most effective framework for this decision problem, followed by the MOORA and WASPAS methods.

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Thermal performance comparison of flat plate pulsating heat pipes of different material thermal conductivity using ethanol-water mixtures

Cited by 3 publications

References 36 publications

Fundamentals and Applications of Surface Wetting

Fundamentals and Applications of Surface Wetting

Heat Transfer Performance of a 3D-Printed Aluminum Flat-Plate Oscillating Heat Pipe Finned Radiator

A comprehensive assessment of working fluids selection in heat pipe-assisted battery thermal management systems: An integrated Multi-criteria decision-making approach

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