Theoretical, experimental and numerical models for wicking

CURATOR

A pinboard by

Mohammad Amin Faghihi Zarandi

PhD Student, University of Wisconsin Milwaukee

PINBOARD SUMMARY

My research focuses on transport and flow studies in porous media, especially porous wicks

My research is about investigating the wicking, absorption of liquids into porous media, such as penetration of ink in paper in inkjet printers or performance of fuel in wicks of torches(TIKI torch for example). By investigating all effective matters in these applications, we will advise industries to produce better and efficient products

6 ITEMS PINNED

Devices and methods for improved delivery of volatile liquids

Abstract: An emanation device for use with a replaceable refill of volatile liquid containing one or more active materials is described wherein the active material comprises at least one of: a fragrance; an insecticide; a fungicide; a pesticide; a sanitizing material; and/or a pharmaceutical; wherein the refill comprises a sealed reservoir containing said volatile liquid and a porous wick which extends from the interior of the reservoir to the exterior thereof, wherein the device comprises: an air pump; a fluid conduit in fluid communication with the air pump such that, in use, air pumped by the pump will flow through the fluid conduit; a nozzle located at the end of the fluid conduit remote from the air pump; a ejector constriction provided in the fluid conduit adjacent or substantially adjacent the nozzle; a liquid conduit provided adjacent the ejector constriction and in fluid communication with the fluid conduit at one end thereof, and open at the other end to receive liquid therein; refill securing means configured to secure the refill relative to the device; characterized in that a mechanism is provided to permit the liquid conduit to at least partially penetrate the porous wick.

Pub.: 17 May '16, Pinned: 30 Jun '17

Air freshening device

Abstract: An air freshening device includes a liquid supply operable to supply liquid fragrance material, a wick in contact with the liquid supply, a conductive mesh material operable to retain the liquid material in interstices thereof, and a power supply operable to apply voltage across the mesh material so as to heat the mesh material and the liquid fragrance material contained in interstices of the mesh material to a temperature sufficient to vaporize the liquid. The air freshening device is operable to substantially prevent deposition of the vaporized liquid material.

Pub.: 27 Dec '16, Pinned: 30 Jun '17

Experimental study of heat transfer and start-up of loop heat pipe with multiscale porous wicks

Abstract: A loop heat pipe (LHP) with composite multiscale porous wicks was designed and investigated. The focus was on heat transfer and start-up characteristics. Three layers of wick were used to form the composite wicks. The primary layer was sintered on the evaporator wall using copper powder with different average particle diameters (dp = 13, 37, 88, and 149 μm) to form a groove multiscale wick. The second layer was laid on top of the first one by a second sintering. The third layer was made of absorbent wool with excellent thermal insulation. A series of experiments were performed to study the effects of various parameters, including wick structures, tilt angles (θ = −90°, 0°, and 90°), liquid filling ratios (38.5–64.1%), liquid line lengths, and heating power. Compared with conventional monoporous wicks, the composite multiscale porous wicks shortened the start-up time, decreased the wall temperature, and suppressed the temperature instability of the LHP. At a heat load of 200 W, the LHP with composite wicks could reach a heat flux of 40 W/cm2 for the anti-gravity operation, under which the wall temperature was only 63 °C. Some reasons that accounted for performance improvement were as follows: the porous groove wall increased the surface area and multiscale structures realized a successful synergy between vapor release and liquid supply, large pores for vapor release, and small pores for liquid suction. In addition, a synergy between thermal conductivity and insulation was achieved, which ensured a high thermal conductivity for the primary layer wick and a good thermal insulation for the entire wick. This greatly reduced the heat leakage from the evaporator to the compensation chamber.

Pub.: 27 Jan '17, Pinned: 30 Jun '17

Investigation of the structural and hydraulic properties of capillary porous materials for heat pipes

Abstract: The article analyzes the principal requirements regarding the properties of capillary porous materials for wicks of antigravitation heat pipes. Their porosity, coefficients of permeability and sinuosity are determined.

Pub.: 01 Apr '86, Pinned: 30 Jun '17

Filtration of an aqueous salt solution in capillary-porous materials in the presence of a phase transition

Abstract: The position of the saturation boundary of an aqueous salt solution during filtration and salinization of capillary-porous wicks is determined as a function of density of the incident thermal flux.

Pub.: 01 Feb '87, Pinned: 30 Jun '17

Effects of Particle Size and Particle Size Distribution on Heat Dissipation of Heat Pipes with Sintered Porous Wicks

Abstract: Permeability and capillary pressure are the two main characteristics that are frequently referenced in discussing the performances of the sintered wick in a heat pipe. These properties are closely related to the copper powder used. To investigate the effect of mean particle size and particle size distribution on these two properties and the resultant heat dissipation, three gas-atomized Cu powders with different particle sizes, 65, 92, and 128 μm, were examined. The results of thermal performance show that the coarse powder was favorable due to its larger pore size and lower sintered density, which was attributed to the heavier water vapor formation from its high intrinsic oxygen content and the hydrogen atmosphere. The data also showed that powders with narrower particle size distributions result in better thermal performance than those with wide distributions. Since the explanation of the heat dissipation based on the permeability and capillary pressure was not satisfactory, a new method, using capillary speed along with porosity, was applied. This method was shown to be more effective and more practical in evaluating the influence of powder characteristics on the heat dissipation performance of sintered porous wick structures.

Pub.: 25 Jun '09, Pinned: 30 Jun '17

Theoretical, experimental and numerical models for wicking in wicks