Journal of Heat Transfer: Recent submissions
Now showing items 1301-1320 of 3611
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Effective Spectral Emissivity of Gas Turbine Blades for Optical Pyrometry
(The American Society of Mechanical Engineers (ASME), 2017)Turbine blade temperature measurements are important for monitoring the turbine engine performance to protect the hot components from damage due to excess temperatures. However, the reflected radiation from the blades and ... -
Effect of Thermal Properties of a Coated Elastohydrodynamic Lubrication Line Contact Under Various Slide-to-Roll Ratios
(The American Society of Mechanical Engineers (ASME), 2017)A numerical thermal elastohydrodynamic lubrication (EHL) model is developed for coated line contacts by considering both the mechanical properties and the thermal properties of the coating and the substrate. The temperature ... -
Optimal Perturbation Iteration Method for Solving Nonlinear Heat Transfer Equations
(The American Society of Mechanical Engineers (ASME), 2017)In this paper, the new optimal perturbation iteration method (OPIM) is introduced and applied for solving nonlinear differential equations arising in heat transfer. The effectiveness of the proposed method will be tested ... -
Investigation of the Influence of Elevated Pressure on Subcooled Boiling Flow—Model Evaluation Toward Generic Approach
(The American Society of Mechanical Engineers (ASME), 2017)Modeling subcooled boiling flows in vertical channels has relied heavily on the utilization of empirical correlations for the active nucleation site density, bubble departure diameter, and bubble departure frequency. ... -
Heat Transfer Photogallery
(The American Society of Mechanical Engineers (ASME), 2017) -
Numerical Simulation of Evaporating Two-Phase Flow in a High-Aspect-Ratio Microchannel with Bends
(The American Society of Mechanical Engineers (ASME), 2017)Flow boiling was investigated on a hydrophobic surface by coating Teflon® onto a 1×1 cm2 copper surface, resulting in contact angle of 118°. The images depicted were taken using distilled water flowing at 299 kg/m2s with ... -
Electron Mobility across Grain Boundaries in Graphene Synthesized using Chemical Vapor Deposition Process
(The American Society of Mechanical Engineers (ASME), 2017)Chemical vapor deposition (CVD) is currently the only method for large-scale synthesis of graphene. However, the CVD process introduces grain boundaries (GBs) when individual grains coalesce with various mismatch angles. ... -
On Elliptic Inverse Heat Conduction Problems
(The American Society of Mechanical Engineers (ASME), 2017)This note is concerned with a new method for the solution of an elliptic inverse heat conduction problem (IHCP). It considers an elliptic system where no information is given at part of the boundary. The method is iterative ... -
Dynamics of a Leidenfrost Droplet Modulated by Electrowetting
(The American Society of Mechanical Engineers (ASME), 2017)Leidenfrost phenomenon is closely related to film boiling and the critical heat flux (CHF) limit of boiling heat transfer. Understanding the mechanisms of Leidenfrost phenomenon and devising effective ways to suppress it ... -
Condensation in Microchannels: Detailed Comparisons of Annular Laminar Flow Theory With Measurements
(The American Society of Mechanical Engineers (ASME), 2017)A relatively simple theory of annular laminar film condensation in microchannels, based on the Nusselt approximations for the condensate film and a theoretically based approximation for the vapor shear stress, has no ... -
Multi-Objective Optimization of Laminar Heat Transfer and Friction Factor in Rectangular Microchannel With Rectangular Vortex Generators: An Application of NSGA-II With Gene Expression Programing Metamodel
(The American Society of Mechanical Engineers (ASME), 2017)Improvement of the effectiveness of heat exchanger is the demand of compact and efficient cooling devices. In that respect, a numerical study of fluid flow and heat transfer has been conducted with different arrangements ... -
Heat Transfer Modeling of the Capillary Fiber Drawing Process
(The American Society of Mechanical Engineers (ASME), 2017)Considerable recent research has focused on the ability of microstructured fibers to exhibit diverse optical functionalities. However, accurately preserving the structure imposed at the preform stage after drawing it down ... -
On Temperature Jump Condition for Slip Flow in a Microchannel With Constant Wall Temperature
(The American Society of Mechanical Engineers (ASME), 2017)The analytical solution in the fully developed region of a slip flow in a circular microtube with constant wall temperature is obtained to verify the conventional temperature jump boundary condition when both viscous ... -
Heat Transfer Enhancement in Turbulent Ribbed-Pipe Flow
(The American Society of Mechanical Engineers (ASME), 2017)The present study aims at explaining why heat transfer is enhanced in turbulent ribbed-pipe flow, based on our previous large eddy simulation (LES) database (Kang and Yang, 2016, “Characterization of Turbulent Heat Transfer ... -
Geometric Mean of Fin Efficiency and Effectiveness: A Parameter to Determine Optimum Length of Open-Cell Metal Foam Used as Extended Heat Transfer Surface
(The American Society of Mechanical Engineers (ASME), 2017)High porosity open-cell metal foams have captured the interest of thermal industry due to their high surface area density, low weight, and ability to create tortuous mixing of fluid. In this work, application of metal foams ... -
Analysis of Entropy Generation Due to Micropolar Fluid Flow in a Rectangular Duct Subjected to Slip and Convective Boundary Conditions
(The American Society of Mechanical Engineers (ASME), 2017)The entropy generation due to steady, incompressible micropolar fluid flow in a rectangular duct with slip and convective boundary conditions (CBCs) is calculated. An external uniform magnetic field is applied which is ... -
Transient Heat Conduction in On-Chip Interconnects Using Proper Orthogonal Decomposition Method
(The American Society of Mechanical Engineers (ASME), 2017)A major challenge in maintaining quality and reliability in today's microelectronics chips comes from the ever increasing levels of integration in the device fabrication, as well as from the high current densities. Transient ... -
Experimental Investigation of Film-Cooling Effectiveness of a Highly Loaded Turbine Blade Under Steady and Periodic Unsteady Flow Conditions
(The American Society of Mechanical Engineers (ASME), 2017)This paper describes the experimental investigations of film-cooling effectiveness on a highly loaded low-pressure turbine blade under steady and unsteady wake flow conditions. The cascade facility in Turbomachinery ... -
Numerical Re-examination of Chilton–Colburn Analogy for Variable Thermophysical Fluid Properties
(The American Society of Mechanical Engineers (ASME), 2017)The Chilton–Colburn analogy is very helpful for evaluating the heat transfer in internal forced flows. The Chilton–Colburn analogy between the Chilton–Colburn j-factor for heat transfer, jH (St·Pr2/3) and the Fanning ... -
Natural Convection Heat Transfer From a Short or Long, Solid or Hollow Horizontal Cylinder Suspended in Air or Placed on Ground
(The American Society of Mechanical Engineers (ASME), 2017)Numerical simulations have been conducted to study natural convection heat transfer from solid or hollow cylinders in the laminar range of Ra spanning from 104 to 108 for L/D in the range of 0.05≤(L/D)≤20. Interesting flow ...