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Wednesday, July 22, 2020 | History

2 edition of A study of wire mesh wick characteristics in a longitudinal heat pipe found in the catalog.

A study of wire mesh wick characteristics in a longitudinal heat pipe

by Oscar Jonathan Hickox

  • 268 Want to read
  • 35 Currently reading

Published by Naval Postgraduate School in Monterey, California .
Written in English

    Subjects:
  • Mechanical engineering

  • ID Numbers
    Open LibraryOL25128521M

      Screen wick wire diameter (m) F l. Garimella S () A mathematical model for analyzing the thermal characteristics of a flat micro heat pipe with a grooved wick. Int J Heat Mass Transf – CrossRef Google Maezawa S () Study on solar cell cooling by heat pipe. In: Proceedings of the 8th international heat pipe symposium. Difference between wick heat pipe and thermosyphon. The wick and wickless (thermosyphon) heat pipes have many features in common in their construction, operation and applications. However, they differ in some aspects such as: Wick material: unlike in thermosyphon, wick materials are lined on the inner parts of the wick heat pipe.

      A gas-loaded molybdenum-sodium heat pipe was built to demonstrate the active pressure-control principle applied to a refractory metal heat pipe. Other work during the period included the development of processing procedures for and fabrication and testing of three types of sodium heat pipes using Haynes , MA , and MA wall materials to. The loop heat pipe was first studied for the difficult temperature control conditions under aerospace conditions. The loop heat pipe is composed of evaporator, reservoir, capillary wick, vapor/liquid line, and condenser. Different working fluids, different liquid filling amounts, different capillary wicks, different sizes, and different cooling methods will have an important impact on the.

      Micro-electro-mechanical systems (MEMS)-based micro-heat pipes, as a novel heat pipe technology, is considered as one of the most promising options for thermal control applications in microelectronic circuits packaging, concentrated solar cells, infrared detectors, micro-fuel cells, etc. The operating principles, heat transfer characteristics, and fabrication process of MEMS-based micro. Sintering or frittage is the process of compacting and forming a solid mass of material by heat or pressure without melting it to the point of liquefaction.. Sintering happens naturally in mineral deposits or as a manufacturing process used with metals, ceramics, plastics, and other atoms in the materials diffuse across the boundaries of the particles, fusing the particles.


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A study of wire mesh wick characteristics in a longitudinal heat pipe by Oscar Jonathan Hickox Download PDF EPUB FB2

Among the three results, the sintered wick heat pipe obtains a maximum reduction in thermal resistance ratio of % compared with mesh wick heat pipe at 45° inclination angle. The porosity and permeability of wick structures play a vital role in the enhancement of thermal performance and it is clearly discussed in Section Cited by: A study of wire mesh wick characteristics in a longitudinal heat pipe.

By Oscar Jonathan Hickox Download PDF (3 MB)Author: Oscar Jonathan Hickox. A slab-wick heat pipe was fabricated and tested for applications where the condenser temperature is in a range of 80 to The pipe material was mm O.D.

copper tube and the working fluids. In the present study, thermal performances of water-filled and and vol% SiC/water nanofluids-filled heat pipes with a screen mesh wick and water-filled heat pipe with a. A heat pipe is a heat-transfer device that combines the principles of both thermal conductivity and phase transition to effectively transfer heat between two solid interfaces.

At the hot interface of a heat pipe, a liquid in contact with a thermally conductive solid surface turns into a vapor by absorbing heat from that surface.

The vapor then travels along the heat pipe to the cold interface. 1. Introduction. Heat pipes are devices which can efficiently transfer heat through the use of internal phase change.

Heat pipe without wick or thermosyphon, can work efficiently at the bottom heat mode, however at the horizontal heat mode or the top heat mode, it cannot work because working fluid inside heat pipe cannot return to the evaporator section to absorb heat.

A numerical model has been developed to determine the effect of the wire screen mesh (wick) type on the heat transfer performance of copper-water wicked heat pipe.

This model represented as steady. Fig. Heat radiation characteristics of conventional and the industry to fabricate heat pipes are grooved tube and wire screen mesh that were The heat pipe wick structure provides a. Each heat pipe is 4 mm thick, 20 mm wide and 80 mm long, with two layers of No.

copper mesh as the wicking material. A copper/silicone rubber hybrid structure is designed and fabricated to achieve the flexibility of the heat pipe. Thermal characteristics are measured and studied for de-ionized water under different working conditions.

Therefore, to design a 3D-printed wick, knowing the pore size and porosity, as well as estimating flow velocity (v = q/ρh fg, where v is the fluid velocity, q is the applied heat flux and h fg is the latent heat of vaporization) through the heat pipe, the pressure drop can be obtained either by Darcyan or non-Darcyan flow regime depending the.

In this work, heat pipe is designed and made to cool the electronic devices based on the case study on different parameters (pipe ma-terial, working fluid, length, angle, mesh size of wick).

The. Get homework help fast. Search through millions of guided step-by-step solutions or ask for help from our community of subject experts 24/7. Try Chegg Study today. By flattening copper pipes with 6 mm diameter, Aoki et al.

fabricated two ultra-thin heat pipes with copper mesh screen as wick structure, and the 1 mm-thick heat pipe could dissipate 20 W with a heating area of 4 cm 2, while the mm-thick heat pipe could only stand 7 W, their thermal resistances were approximately °C/W and °C/W.

The heat pipe evaporator is positioned on the focal axis of the reflector, while the condenser section is completely immersed in the water cylindrical tank. The copper wire mesh wick is used as the capillary structure, and the working fluid is distillated water. Mwaba et al. 14 studied the influence of wick characteristics on heat pipe performance using numerical methods.

They considered screen-mesh and sintered-copper wicks as the porous medium in heat pipes and pointed out that a heat pipe with a composite wick structure gives the best performance. Hanlon and Ma 8 pre.

To better understand the mechanisms that govern the behavior of pool boiling on horizontal highly conductive microporous coated surfaces, a series of experimental investigations were designed to systematically examine the effects of the geometric dimensions (i.e., coating thickness, volumetric porosity, and pore size, as well as the surface conditions of the porous coatings) on the.

The simplest type of wick structure to use is a single-layer wire mesh screen wick shown in Table 1. The design was validated through basic experimental tests which demonstrate the cooling capability of this structure (maximum heat transfer is 30 W).

The capillary structure is inserted and positioned within the envelope prior to the secondary press process. In this study, an aluminum flat heat pipe (AFHP) with mm total thickness, mm total length, and a capillary structure with braided or carbon wire bundles added thereto was designed and manufactured.

Consequently, heat pipes can be a viable and promising solution for this challenge. In this chapter, a CPU thermal design power (TDP), cooling methods of electronic equipments, heat pipe theory and operation, heat pipes components, such as the wall material, the wick structure, and the working fluid, are presented.

Part I of the investigation described the wicking fabrication process and experimental test facility, and focused on the effects of the capillary wick thickness (ASME J. Heat Transfer.,pp. In Part II, we examine the effects of variations in the volumetric porosity and the mesh size.

Figure 3 is a schematic drawing of the heat pipe illustrating the basic features and operation. Within the closed shell of a heat pipe a liquid working fluid and some sort of capillary action pump (e.g., wire mesh, pcrsus wick, or longitudinal grooves) comprise the heat transfer loop.

When heat is added to the evaporator end of the heat.The use of heat pipes in rotating environments has prompted many analytical, numerical, and experimental investigations of the heat transfer characteristics of these devices. Past investigations, however, have been restricted to the study of straight heat pipes.

In this work, a curved rotating heat pipe is studied numerically and [email protected]{osti_, title = {Heat pipe computer program (HTPIPE) user's manual}, author = {Prenger, Jr, F C}, abstractNote = {Program HTPIPE is a hydrodynamic model of heat pipe performance.

The program was developed for high-performance liquid metal heat pipes but can easily be adapted to other working fluids if thermal transport property values are known.