Journal of Heat Transfer: Recent submissions
Now showing items 1021-1040 of 3611
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Effect of Rounded Corners on Heat Transfer and Fluid Flow Through Triangular Duct
(The American Society of Mechanical Engineers (ASME), 2018)Turbulent flow heat transfer and friction penalty in triangular cross-sectional duct is studied in the present paper. The sharp corners of the duct are modified by converting it into circular shape. Five different models ... -
A New Approach for the Mitigating of Flow Maldistribution in Parallel Microchannel Heat Sink
(The American Society of Mechanical Engineers (ASME), 2018)The problem of flow maldistribution is very critical in microchannel heat sinks (MCHS). It induces temperature nonuniformity, which may ultimately lead to the breakdown of associated system. In the present communication, ... -
Assessment of Heat Transfer Enhancement Using Metallic Porous Foam Configurations in Laminar Slot Jet Impingement: An Experimental Study
(The American Society of Mechanical Engineers (ASME), 2018)An experimental study using the liquid crystal thermography technique is conducted to investigate the convective heat transfer performance in jet impingement cooling using various porous media configurations. Aluminum ... -
Liquid Slippage in Confined Flows: Effect of Periodic Micropatterns of Arbitrary Pitch and Amplitude
(The American Society of Mechanical Engineers (ASME), 2018)The recently confirmed violation of the no-slip boundary condition in the flow of small-molecule liquids through microchannels and nanochannels has technological implications such as friction reduction. However, for ... -
The New Equations for “Rate-Determining Chemisorption of Coal”
(The American Society of Mechanical Engineers (ASME), 2018)The purpose of the new formulas, Cml, CmlK, and CmlY, which express the slowest char combustion rate, is to show the controlling mechanism of single coal burning. Oxygen diffusion through the boundary layer (as a result ... -
Experimental Validation of a Boundary Layer Convective Heat Flux Measurement Technique
(The American Society of Mechanical Engineers (ASME), 2018)If a steady thermal boundary layer is sufficiently thick, wall heat fluxes and associated convective heat transfer coefficients can be directly calculated from measured temperature distributions taken within it using a ... -
Visualization of Dropwise Condensation on a Superhydrophobic Microporous Surface
(The American Society of Mechanical Engineers (ASME), 2018)Condensation behavior on a superhydrophobic microporous surface was visually compared with that on a plain surface in the water saturated at the pressures of 101.3 kPa (Tsat = 100 °C) and 3.2 kPa (Tsat = 25 °C). The ... -
Investigation of Mixed Convection Heat Transfer Through Metal Foams Partially Filled in a Vertical Channel by Using Computational Fluid Dynamics
(The American Society of Mechanical Engineers (ASME), 2018)Two-dimensional computational fluid dynamics simulations of mixed convection heat transfer through aluminum metal foams partially filled in a vertical channel are carried out numerically. The objective of the present study ... -
Solar Selective Volumetric Receivers for Harnessing Solar Thermal Energy
(The American Society of Mechanical Engineers (ASME), 2018)Given the largely untapped solar energy resource, there has been an ongoing international effort to engineer improved solar-harvesting technologies. Toward this, the possibility of engineering a solar selective volumetric ... -
Inverse Estimation of Thermal Properties in a Semitransparent Graded Index Medium With Radiation-Conduction Heat Transfer
(The American Society of Mechanical Engineers (ASME), 2018)An inverse radiation-conduction analysis is performed for simultaneous estimation of the thermal properties in an absorbing, emitting, and linear-anisotropically scattering medium with spatially variable refractive index. ... -
An Experimental Study on Flow Boiling Heat Transfer From a Downward-Facing Finned Surface and Its Effect on Critical Heat Flux
(The American Society of Mechanical Engineers (ASME), 2018)During a severe accident, ex-vessel cooling may pose a risk for larger-powered reactors. The current in-vessel retention (IVR) (through ex-vessel cooling) capability may not be sufficient for the larger-powered reactors, ... -
Heat Transfer Modeling of Spent Nuclear Fuel Using Uncertainty Quantification and Polynomial Chaos Expansion
(The American Society of Mechanical Engineers (ASME), 2018)A novel method that incorporates uncertainty quantification (UQ) into numerical simulations of heat transfer for a 9 × 9 square array of spent nuclear fuel (SNF) assemblies in a boiling water reactor (BWR) is presented in ... -
Pool Boiling of Low-Global Warming Potential Replacements for R134a on a Reentrant Cavity Surface
(The American Society of Mechanical Engineers (ASME), 2018)This paper quantifies the pool boiling performance of R134a, R1234yf, R513A, and R450A on a flattened, horizontal reentrant cavity surface. The study showed that the boiling performance of R134a on the Turbo-ESP exceeded ... -
Solution of the Extended Graetz–Nusselt Problem for Liquid Flow Over Isothermal Parallel Ridges
(The American Society of Mechanical Engineers (ASME), 2018)We consider convective heat transfer for laminar flow of liquid between parallel plates. The configurations analyzed are both plates textured with symmetrically aligned isothermal ridges oriented parallel to the flow, and ... -
Influence of Turbulent Combustion Noise on the Decrement Estimates of Gas Oscillations
(The American Society of Mechanical Engineers (ASME), 2018)This paper deals with the autoregression method to determine the logarithmic decrement and natural frequency of gas oscillations in a combustion chamber. The proposed approach to quantify the impact of combustion noise on ... -
Experimental Study About Performance Analysis of Parallel Connected Ranque–Hilsch Counter Flow Vortex Tubes With Different Nozzle Numbers and Materials
(The American Society of Mechanical Engineers (ASME), 2018)An experimental analysis for parallel connected two identical counter flow Ranque–Hilsch vortex tubes (RHVT) with different nozzle materials and numbers was conducted by using compressed air as a working fluid in this ... -
Non-Newtonian Fluid Flow and Heat Transfer in a Semicircular Microtube Induced by Electroosmosis and Pressure Gradient
(The American Society of Mechanical Engineers (ASME), 2018)The hydrodynamic and thermal characteristics of electroosmotic and pressure-driven flows of power-law fluids are examined in a semicircular microchannel under the constant wall heat flux condition. For sufficiently large ... -
Numerical Investigation of Laminar Natural Convection in a Square Cavity With Wavy Wall and Horizontal Fin Attached to the Hot Wall
(The American Society of Mechanical Engineers (ASME), 2018)Laminar natural convection in differentially heated square cavity with right cold wavy wall and horizontal conducting fin attached to its left hot wall has been investigated numerically. The vertical walls are maintained ... -
The Correlation of Heat Transfer Coefficients for the Laminar Natural Convection in a Circular Finned-Tube Heat Exchanger
(The American Society of Mechanical Engineers (ASME), 2018)This study proposes an empirical correlation for laminar natural convection applicable to external circular finned-tube heat exchangers with wide range of configuration parameters. The transient temperature response of the ... -
Nucleate Boiling Comparison between Teflon-Coated Plain Copper and Cu-HTCMC in Water
(The American Society of Mechanical Engineers (ASME), 2018)The hydrophobic, Teflon-coated surfaces on plain copper and Cu-HTCMC (High temperature Thermally Conductive Microporous Coating) compared on pool boiling heat transfer of water. The HTCMC was created by sintering of copper ...