Journal of Heat Transfer: Recent submissions

Now showing items 1761-1780 of 3611

    • Microporous Coatings to Maximize Pool Boiling Heat Transfer of Saturated R 123 and Water 

      Han Kim, Joo; Gurung, Ajay; Amaya, Miguel; Muk Kwark, Sang; You, Seung M. (The American Society of Mechanical Engineers (ASME), 2015)
      The present research is an experimental study for the enhancement of boiling heat transfer using microporous coatings. Two types of coatings are investigated: one that is bonded using epoxy and the other by soldering. ...

    • Second Law Analysis of Heat and Mass Transfer of Nanofluids Along a Plate With Prescribed Surface Heat Flux 

      Khan, Waqar A.; Culham, Richard; Aziz, A. (The American Society of Mechanical Engineers (ASME), 2015)
      A model based on the works of Buongiorno, which includes the effects of Brownian motion and thermophoresis, is used to develop the governing equations for convection in nanofluids. The analysis includes examples with water ...

    • Effects of Entrainment on Incapability of High Intensity Beam Drilling 

      Wei, P. S.; Wu, J. H.; Chao, T. C. (The American Society of Mechanical Engineers (ASME), 2015)
      The effects of entrainment accompanying mass, momentum, and energy transport from the keyhole wall on keyhole collapse during highpowerdensity laser or electron beam drilling are theoretically and systematically investigated ...

    • Filmwise to Dropwise Condensation Transition Enabled by Patterned High Wetting Contrast 

      Hou, Youmin; Yu, Miao; Chen, Xuemei; Wang, Zuankai; Yao, Shuhuai (The American Society of Mechanical Engineers (ASME), 2015)
      Recent advances in condensing surfaces with hybrid architectures of superhydrophobic/hydrophilic patterns allow us to decrease the nucleation energy barrier and spatially control the water condensation. However, the condensed ...

    • Wetting & Wicking Effects of Superhydrophilic Nano Structured Coatings 

      Girard, Adam; Amaya, Miguel; Wi, Hyoseong; You, Seung M. (The American Society of Mechanical Engineers (ASME), 2015)
      Superhydrophilic NanoStructured Coatings (SHNC) were discovered during pool boiling experiments using nanofluids with alumina nanoparticles. During nucleate boiling, the nanoparticles are deposited on the heater surface, ...

    • Visual Observation of Circular Water Jet Impingement Boiling on Stationary Hot Steel Plate 

      Lee, Jungho; Sohn, Sangho; Park, Jaebum (The American Society of Mechanical Engineers (ASME), 2015)
      The timeand spaceresolved water jet impingement heat transfer on stationary hot steel plate was measured by a novel experimental technique that has a function of hightemperature heat flux gauge. The simultaneous visual ...

    • Visual Criteria for Measuring Two phase Flow Rate in Venturi with Flow Homogenizer 

      Lee, Jungho; Sohn, Sangho; Park, Jaebum; Oh, Dong (The American Society of Mechanical Engineers (ASME), 2015)
      A simple use of Venturi might be used to measure twophase flow rate within relatively low GVF(gas volume fraction). Upstream flow entering Venturi can be improved with installed flow homogenizer which is easily fabricated ...

    • A rebounding droplet impacting on a static droplet 

      Moon, Joo Hyun; Choi, Chang Kyoung; Allen, Jeffrey S.; Lee, Seong Hyuk (The American Society of Mechanical Engineers (ASME), 2015)
      This study aims to experimentally examine rebounding characteristics of a freefall droplet which impacts on a static droplet with a sphericalcap shape in a low Weber number range. Two wellaligned highspeed cameras were ...

    • Evaporation of Condensate Droplets on Structured Surfaces with Gradient Roughness 

      Chen, Xuemei; Yao, Shuhuai; Wang, Zuankai (The American Society of Mechanical Engineers (ASME), 2015)
      The study of evaporation dynamics of droplets is of scientific interest and has numerous practical applications. Here, we studied the evaporation of small condensate droplets on structured surfaces with onetier microscale ...

    • Spatial Control of Condensate Droplets on Superhydrophobic Surfaces 

      أ–lأ§eroؤںlu, Emre; McCarthy, Matthew (The American Society of Mechanical Engineers (ASME), 2015)
      Superbiphilic surfaces have been fabricated and characterized using environmental scanning electron microscopy (ESEM) to demonstrate spatial control of microscale droplets during condensation. The surfaces are composed of ...

    • Hierarchical Superhydrophobic Copper for Sustained Dropwise Condensation 

      Chen, Xuemei; Weibel, Justin A.; Garimella, Suresh V. (The American Society of Mechanical Engineers (ASME), 2015)
      Engineering surfaces that sustain continuous dropwise condensation, and are composed of materials commonly employed in heat transfer applications, are of great interest for scaledup industrial systems. We fabricate ...

    • Characteristics of Droplet Growth Behavior on Hydrophobic Micro textured Surfaces 

      Lee, Jae Bin; Moon, Joo Hyun; Cho, Minhaeng; Lee, Seong Hyuk; Choi, Chang Kyoung (The American Society of Mechanical Engineers (ASME), 2015)
      For occurring dropwise condensation, the droplet growth behavior such as single droplet growth, coalescence, and falloff of large droplets play a major role in regard to condensation heat transfer and water harvesting. The ...

    • Dendrite Growth during Freezing of Millimeter Scale Eicosane Droplets 

      Rahman, Md Mahamudur; Hu, Han; Shabgard, Hamidreza; Boettcher, Philipp; Sun, Ying; McCarthy, Matthew (The American Society of Mechanical Engineers (ASME), 2015)
      The freezing characteristics of small diameter eicosane (Tmelt = 37آ°C) droplets are studied here for their use in novel drycooling strategies based on spray freezing of recirculating phase change materials (PCM). PCM can ...

    • Thermal Transport Mechanisms in Carbon Nanotube Nanofluids Identified From Molecular Dynamics Simulations 

      Lee, Jonathan W.; Meade, Jr. ,Andrew J.; Barrera, Enrique V.; Templeton, Jeremy A. (The American Society of Mechanical Engineers (ASME), 2015)
      Atomistic simulations of carbon nanotubes (CNTs) in a liquid environment are performed to better understand thermal transport in CNTbased nanofluids. Thermal conductivity is studied using nonequilibrium molecular dynamics ...

    • Natural Convection in a Wavy Porous Cavity With Sinusoidal Temperature Distributions on Both Side Walls Filled With a Nanofluid: Buongiorno's Mathematical Model 

      Sheremet, M. A.; Pop, I. (The American Society of Mechanical Engineers (ASME), 2015)
      A numerical study of the natural convection flow in a porous cavity with wavy bottom and top walls having sinusoidal temperature distributions on vertical walls filled with a nanofluid is numerically investigated. The ...

    • Advanced Differential Approximation Formulation of the PN Method for Radiative Transfer 

      Pal, Gopalendu; Modest, Michael F. (The American Society of Mechanical Engineers (ASME), 2015)
      The spherical harmonics (PN) method, especially its lowest order, i.e., the P1 or differential approximation, enjoys great popularity because of its relative simplicity and compatibility with standard models for the solution ...

    • Notes on Steady Natural Convection Heat Transfer by Double Diffusion From a Heated Cylinder Buried in a Saturated Porous Media 

      Chaves, Carlos Alberto; Lamas, Wendell de Queiroz; Nunes, Luiz Eduardo Nicolini do Patrocinio; Camargo, Jose Rui; Grandinetti, Francisco Jose (The American Society of Mechanical Engineers (ASME), 2015)
      This paper aims to present numerical solutions for the problem of steady natural convection heat transfer by double diffusion from a heated cylinder buried in a saturated porous media exposed to constant uniform temperature ...

    • Heat Transfer Gallery 

      Kihm, Kenneth D.; Choi, Chang K.; Pratt, David M. (The American Society of Mechanical Engineers (ASME), 2015)
      The purpose of publishing these entries is to draw attention to the innovative features of visualization techniques and aesthetic qualities of thermal processes. To focus on visualization images and schematics for each ...

    • Neutron Radiography of Condensation and Evaporation of Hydrogen in a Cryogenic Condition 

      Bellur, Kishan; Medici, Ezequiel; Allen, Jeffrey; Choi, Chang Kyoung; Hermanson, Jimes; Tamilarasan, Arun; Hussey, Daniel; Jacobson, David; Leao, Juscelino B.; McQuillen, John (The American Society of Mechanical Engineers (ASME), 2015)
      The condensation and evaporation of hydrogen under cryogenic conditions is visualized by using neutron imaging at the BT2 Beam Facility at the National Institute of Standards and Technology (NIST). The condensation and ...

    • Numerical Evaluation of Novel Shaped Holes for Enhancing Film Cooling Performance 

      Yang, Xing; Liu, Zhao; Feng, Zhenping (The American Society of Mechanical Engineers (ASME), 2015)
      The overall film cooling performance of three novel film cooling holes has been numerically investigated in this paper, including adiabatic film cooling effectiveness, heat transfer coefficients as well as discharge ...