Journal of Heat Transfer: Recent submissions
Now showing items 1221-1240 of 3611
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One-Dimensional Analysis of Gas Diffusion-Induced Cassie to Wenzel State Transition
(The American Society of Mechanical Engineers (ASME), 2017)We develop a one-dimensional model for transient diffusion of gas between ridges into a quiescent liquid suspended in the Cassie state above them. In the first case study, we assume that the liquid and gas are initially ... -
On Temporal Biphilicity: Definition, Relevance, and Technical Implementation in Boiling Heat Transfer
(The American Society of Mechanical Engineers (ASME), 2017)Solid–fluid interfaces switching from a superhydrophilic to a superhydrophobic wetting state are desired for their ability to control and enhance phase-change heat transfer. Typically, these functional surfaces are fabricated ... -
The Reasons of Heat Transfer Enhancement in a Laminar Channel Flow With Uniform Heat Flux on the Wall Under a Pair of Longitudinal Vortex Generators Mounted on the Bottom Wall
(The American Society of Mechanical Engineers (ASME), 2017)To find the reasons of heat transfer enhancement of a laminar convective heat transfer process in a channel at a uniform heat flux boundary when a pair of longitudinal vortex generators (VGs) is mounted on the bottom wall, ... -
Enhanced Subcooled Flow Boiling Heat Transfer in Microchannel With Piranha Pin Fin
(The American Society of Mechanical Engineers (ASME), 2017)An experimental study on subcooled flow boiling with engineering fluid HFE-7000 in a microchannel fitted with piranha pin fins (PPFs) is presented. Heat fluxes of up to 735 W/cm2 were achieved and mass fluxes ranged from ... -
Experimental Study of Horizontal Flow Boiling Heat Transfer of R134a at a Saturation Temperature of 18.6 °C
(The American Society of Mechanical Engineers (ASME), 2017)In spite of the extensive work in flow boiling in small-diameter tubes, the general characteristics and dominant mechanisms remain elusive. In this study, flow boiling heat transfer of R134a inside a 5 mm I.D., smooth ... -
Efficient Numerical Evaluation of Exact Solutions for One-Dimensional and Two-Dimensional Infinite Cylindrical Heat Conduction Problems
(The American Society of Mechanical Engineers (ASME), 2017)Estimation of thermal properties or diffusion properties from transient data requires that a model is available that is physically meaningful and suitably precise. The model must also produce numerical values rapidly enough ... -
How Nanostructures Affect Water Droplet Nucleation on Superhydrophobic Surfaces
(The American Society of Mechanical Engineers (ASME), 2017)Nucleation is the first stage of phase change phenomena, including condensation on nanostructured superhydrophobic surfaces. Despite plenty of theoretical studies on the effect of nanostructure density and shape on water ... -
A Computational Study on the Effects of Surface Tension and Prandtl Number on Laminar-Wavy Falling-Film Condensation
(The American Society of Mechanical Engineers (ASME), 2017)Characterization of wavy film heat and mass transfer is essential for numerous energy-intensive chemical and industrial applications. While surface tension is the underlying cause of film waviness, widely used correlations ... -
Probing the Local Heat Transfer Coefficient of Water-Cooled Microchannels Using Time-Domain Thermoreflectance
(The American Society of Mechanical Engineers (ASME), 2017)The demands for increasingly smaller, more capable, and higher power density technologies have heightened the need for new methods to manage and characterize extreme heat fluxes. This work presents the use of an anisotropic ... -
Effect of Experimental Method on the Heat Transfer Performance of Supercritical Carbon Dioxide in Microchannel
(The American Society of Mechanical Engineers (ASME), 2017)This paper provides an experimental investigation of heat transfer and pressure drop of supercritical carbon dioxide cooling in a microchannel heat exchanger. An extruded flat aluminum tube with 37 parallel channels and ... -
Boiling Performance of Graphene Oxide Coated Copper Surfaces at High Pressures
(The American Society of Mechanical Engineers (ASME), 2017)Graphene has been investigated due to its mechanical, optical, and electrical properties. Graphene's effect on the heat transfer coefficient (HTC) and critical heat flux (CHF) in boiling applications has also been studied ... -
Pool Boiling Heat Transfer Characteristics of Inclined pHEMA-Coated Surfaces
(The American Society of Mechanical Engineers (ASME), 2017)New requirements for heat exchangers offered pool boiling heat transfer on structured and coated surfaces as one of the promising methods for effective heat removal. In this study, pool boiling experiments were conducted ... -
Microscale Morphology Effects of Copper–Graphene Oxide Coatings on Pool Boiling Characteristics
(The American Society of Mechanical Engineers (ASME), 2017)Enhanced pool boiling heat transfer, with simultaneous increase in critical heat flux (CHF) and heat transfer coefficient (HTC), is desired to improve overall system efficiency and reduce equipment size and cost. This paper ... -
Effects of Interface Velocity, Diffusion Rate, and Radial Velocity on Colloidal Deposition Patterns Left by Evaporating Droplets
(The American Society of Mechanical Engineers (ASME), 2017)This investigation experimentally examines the role of interface capture on the transport and deposition of colloidal material in evaporating droplets. It finds that deposition patterns cannot be characterized by the ratio ... -
Directional Passive Condensate Film Drainage on a Horizontal Surface With Periodic Asymmetrical Structures
(The American Society of Mechanical Engineers (ASME), 2017)Condensation of a highly wetting fluid on a horizontal surface with asymmetric millimeter-sized ratchets and periodically located film drainage pathways (DPs) in the spanwise direction is characterized. The hypothesis to ... -
Effect of Thermophysical Properties of the Heater Substrate on Critical Heat Flux in Pool Boiling
(The American Society of Mechanical Engineers (ASME), 2017)While the role of the liquid properties, surface morphology, and operating conditions on critical heat flux (CHF) in pool boiling is well investigated, the effect of the properties of the heater material is not well ... -
Lattice Boltzmann Simulations of Macro/Microscale Effects on Saturated Pool Boiling Curves for Heated Horizontal Surfaces
(The American Society of Mechanical Engineers (ASME), 2017)Results of lattice Boltzmann (LB) simulations of macroscale effects (heating modes, heater size, and saturation temperature) as well as microscale effects (wettability and roughness) on saturated pool boiling from superheated ... -
Effect of Length Scales on the Boiling Enhancement of Structured Copper Surfaces
(The American Society of Mechanical Engineers (ASME), 2017)Boiling heat transfer can be substantially altered with the addition of surface structures. While significant enhancements in critical heat flux (CHF) and heat transfer coefficient (HTC) have been demonstrated using this ... -
Physics of the Microchannel Flow Boiling Process and Comparison With the Existing Theories
(The American Society of Mechanical Engineers (ASME), 2017)In this study, six benchmark experiments are conducted on bubbles at different growth stages to evaluate the assumptions of the existing microchannel flow boiling heat transfer models/hypothesis. The results show that the ... -
Comparison of the Volume of Fluid and CLSVOF Methods for the Assessment of Flow Boiling in Silicon Microgaps
(The American Society of Mechanical Engineers (ASME), 2017)The three-dimensional (3D) stacking of integrated circuits (ICs), and emergent microelectronic technologies require low-profile cooling solutions for the removal of relatively high heat fluxes. The flow boiling of dielectric ...