Journal of Heat Transfer: Recent submissions
Now showing items 1041-1060 of 3611
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Nonhomogeneous Dual-Phase-Lag Heat Conduction Problem: Analytical Solution and Select Case Studies
(The American Society of Mechanical Engineers (ASME), 2018)Finite integral transform techniques are applied to solve the one-dimensional (1D) dual-phase heat conduction problem, and a comprehensive analysis is provided for general time-dependent heat generation and arbitrary ... -
Convective Boiling of R-134a Near the Micro-Macroscale Transition Inside a Vertical Brazed Plate Heat Exchanger
(The American Society of Mechanical Engineers (ASME), 2018)Heat transfer and pressure drop characteristics of R-134a boiling in a chevron-patterned brazed plate heat exchanger (BPHE) are studied experimentally. With corrugated BPHE channels having hydraulic diameter of 3.4 mm and ... -
Impact of Viscous Dissipation on Fully Developed Natural Convection Flow in a Vertical Microchannel
(The American Society of Mechanical Engineers (ASME), 2018)In this research paper, fully developed natural convection flow in a vertical parallel plate's micro-channel in the presence of viscous dissipation is theoretically examined by using a perturbation series method. The effects ... -
Condensation of R134a and R22 in Shell and Tube Condensers Mounted With High-Density Low-Fin Tubes
(The American Society of Mechanical Engineers (ASME), 2018)In this work, the condensation of refrigerants on a single, high-density, low-fin tube and full-sized shell and tube condensers were investigated experimentally. The low-fin tube had an external fin density of 56 fins per ... -
A Numerical Study on Electrowetting-Induced Droplet Detachment From Hydrophobic Surface
(The American Society of Mechanical Engineers (ASME), 2018)Electrowetting-induced microwater droplet detachment from hydrophobic surface has been studied numerically. The governing equations for transient microfluidic flow are solved by a finite volume scheme with a two-step ... -
Transient Natural Convection Heat Transfer to CO2 in the Supercritical Region
(The American Society of Mechanical Engineers (ASME), 2018)Present research paper investigates the transient laminar free convective supercritical carbon dioxide flow past a semi-infinite vertical cylinder using numerical methods. Two new thermodynamic models for the supercritical ... -
Entropy Generation in Water-Based Natural Circulation Loop
(The American Society of Mechanical Engineers (ASME), 2018)Natural circulation loop (NCL) based secondary fluid systems are simple, reliable, and inexpensive due to the absence of any moving components such as pumps. Water-based NCLs are widely used in applications such as solar ... -
Secondary Flow and Entropy Generation of Laminar Mixed Convection in the Entrance Region of a Horizontal Square Duct
(The American Society of Mechanical Engineers (ASME), 2018)The flow structure, heat transfer, and entropy generation characteristics in the entrance region of mixed convection under the effect of transverse buoyancy force are investigated numerically. Results are obtained for ... -
Improved Model for Calculating Instantaneous Efficiency of Flat-Plate Solar Thermal Collector
(The American Society of Mechanical Engineers (ASME), 2018)The performance of a flat-plate solar collector is usually assessed by its efficiency. This efficiency is normally defined on a steady-state basis, which makes it difficult to correctly track the instantaneous performance ... -
The Enthalpy-Transforming-Based Lattice Boltzmann Model for Solid–Liquid Phase Change
(The American Society of Mechanical Engineers (ASME), 2018)A new lattice Boltzmann (LB) model to solve the phase change problem, which is based on the enthalpy-transforming model has been developed in this paper. The problems of two-region phase change, natural convection of air, ... -
Experimental Study on Combined Cooling Method for Porous Struts in Supersonic Flow
(The American Society of Mechanical Engineers (ASME), 2018)A combined transpiration and opposing jet cooling method was experimentally investigated for protecting porous struts with microslits in the leading edge. Schlieren images showed that this cooling method significantly ... -
Application of Landweber Method for Three-Dimensional Temperature Field Reconstruction Based on the Light-Field Imaging Technique
(The American Society of Mechanical Engineers (ASME), 2018)Combined with the light-field imaging technique, the Landweber method is applied to the reconstruction of three-dimensional (3D) temperature distribution in absorbing media theoretically and experimentally. In the theoretical ... -
The Thermal Response of Intumescent Coating Under Different Combinations of External Heat Fluxes
(The American Society of Mechanical Engineers (ASME), 2018)In this study, the heat-blocking performance of intumescent coating under various combinations of external radiative and convective heat fluxes is investigated numerically. The results show that the temperature distribution ... -
Modeling of Heat Transfer in Intumescent Fire-Retardant Coating Under High Radiant Heat Source and Parametric Study on Coating Thermal Response
(The American Society of Mechanical Engineers (ASME), 2018)In this study, a new model for intumescent coatings is developed including the radiation transfer equation. So, one of the important features of this model is to give the insight of the radiative heat transfer in intumescent ... -
A Symplectic Analytical Singular Element for Steady-State Thermal Conduction With Singularities in Anisotropic Material
(The American Society of Mechanical Engineers (ASME), 2018)Modeling of steady-state thermal conduction for crack and v-notch in anisotropic material remains challenging. Conventional numerical methods could bring significant error and the analytical solution should be used to ... -
Experimental Study on Construction of a Newly Supersonic Oven With Liquid Lithium
(The American Society of Mechanical Engineers (ASME), 2018)The seeded supersonic oven originally used to produce sodium clusters was incapable for lithium clusters that should be produced at higher temperatures. Ultimately, we designed a new compact stainless steel (SS) oven with ... -
Visualization of Two-Phase Flow in Serpentine Heat Exchanger Passages With Microscale Pin Fins
(The American Society of Mechanical Engineers (ASME), 2018)Microchannel heat exchangers offer the potential for high heat transfer coefficients; however, implementation challenges must be addressed to realize this potential. Maldistribution of phases among the microchannels and ... -
Addressing Two-Phase Flow Maldistribution in Microchannel Heat and Mass Exchangers
(The American Society of Mechanical Engineers (ASME), 2018)Multiphase flow phenomena in single micro and minichannels have been widely studied. Characteristics of two-phase flow through a large array of microchannels are investigated here. An air–water mixture is used to represent ... -
Image-Based Rapid Measurements of Temperature-Dependent Thermal Conductivities
(The American Society of Mechanical Engineers (ASME), 2018)This study establishes an image-based approach to determine the thermal conductivity of a metal material as a function of temperature using isotherm movement. The thermal conductivity within a range of temperature can be ... -
Spreading and Contact Resistance Formulae Capturing Boundary Curvature and Contact Distribution Effects
(The American Society of Mechanical Engineers (ASME), 2018)There is a substantial and growing body of literature which solves Laplace's equation governing the velocity field for a linear-shear flow of liquid in the unwetted (Cassie) state over a superhydrophobic surface. Usually, ...