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Research Papers

Molecular-to-Large-Scale Heat Transfer With Multiphase Interfaces: Current Status and New Directions

[+] Author and Article Information
Raj M. Manglik, Milind A. Jog

Thermal-Fluids and Thermal Processing Laboratory, University of Cincinnati, Cincinnati, OH 45221-0072

J. Heat Transfer 131(12), 121001 (Oct 15, 2009) (11 pages) doi:10.1115/1.4000007 History: Received July 29, 2009; Revised August 06, 2009; Published October 15, 2009

The scientific understanding of multiphase interfaces and the associated convective mass, momentum, and heat transport across and along their boundaries, provide the fundamental underpinnings of the advancement of boiling heat transfer, two-phase flows, heat pipes, spray cooling, and droplet-film coating, among many other engineering applications. Numerous studies have tried to characterize the interfacial behavior and model their mechanistic influences either directly or implicitly via parametric experimental investigations and/or simulations. The goal of advancing our understanding as well as developing generalized, perhaps “universal,” and more accurate phenomenological or mechanistic correlations, for predicting mass, momentum, and heat transfer, continues to engage the worldwide research community. A collection of some such current investigations that are representative of both basic and applied issues in the field is presented in this special issue of the Journal of Heat Transfer.

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Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic representation of the influence of gas-liquid and liquid-solid interfacial properties on (a) boiling bubble nucleation and its dynamics and (b) drop-impact and postimpact droplet-surface dynamics

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Figure 2

Prediction on heat transfer in the nucleate pool-boiling regime in water from a cylindrical horizontal heater for saturated conditions at atmospheric pressure from different correlations in the literature and comparison with representative experimental data (62)

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Figure 3

Schematic representation of surfaces with the same average roughness Ra but different structure of cavities: (a) shallow, (b) conical, (c) re-entrant, and (d) combination set of (a)–(c)-type cavities

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Figure 4

Different levels of heat flux encountered in chip-level immersion cooling in microelectronic applications and the maximum burnout reported in the literature for uniform heating conditions (80-81)

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Figure 5

Liquid-vapor/gas interface dynamics: (a) conceptualization of reagent molecular transport at a bubble interface during nucleate boiling (not to scale) and (b) the effect of the dynamic surface tension of a surfactant (SDS) solution on the evolved predeparture shape and size of bubbles in an adiabatic air-liquid experiment (141)

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Figure 6

Postimpact (at t=10 ms) spreading of constant We(∼28) droplets of water and aqueous surfactant solutions on glass (hydrophilic) and Teflon (hydrophobic) substrates (95)

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Figure 7

A switchable hydrophilic surface: mechanism for UV-light-induced molecular transformation of a TiO2 photocatalyst layer and change of hydrophobic surface to a hydrophilic one and vice versa (140)

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Figure 8

Morphology of microscale helical twisted ribbons produced by self-assembled achiral X-shaped π-conjugated molecules synthesized from 3,4-dihydroxybenzaldehyde (158)

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Figure 9

Reconstructions of two distillation stills from the Hastinapur excavations (∼300B.C.E. ), with boiler, condenser, and receiving crucible in one integral structure (167-168,171)

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Figure 10

Rendering of distillation equipment from ancient India composed of a boiler and condenser connected with a tube based on excavated artifacts from (a) Shaikhan Dheri (∼200B.C.E. ) (161,169) and (b) from Taxila (∼100B.C.E. ) (161,170)

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Figure 11

(a) Photograph of Zawar Mala (Rajasthan, India) excavation site (162) showing the ancient zinc smelting furnace, or kosthi, and (b) rendering of the furnace depicting various excavated equipment elements (retort, retort-base cup, and perforated holding plate) (162,172)

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Figure 12

Depiction of an apparatus for treating certain otological ailments described in Sushruta’s Samhita (∼800−600B.C.E. ), consisting of producing herb-extract laden steam by boiling medicinal plants and delivering it to the ear via a curved or twisted tube made of woven grass (section A) and wrapped in herbs (section B) (164)

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