Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 24 for “"heat transfer correlations"”.
-
Developing 1-D heat transfer correlations for supercritical water and carbon dioxide in vertical tubes
… SuperCritical Fluids (SCFs) as working fluids in heat transfer cycles is proposed Generation IV designs. An important aspect towards development of SCF applications in novel Gen IV Nuclear Power Plant (NPP) designs is to understand the thermodynamic behavior and prediction of Heat Transfer …
-
Gas heat transfer in a heated vertical channel under deteriorated turbulent heat transfer regime
… Fast Reactor (GFR). Due to its high surface heat flux and low coolant velocities under natural circulation in post-LOCA scenarios, the capability of turbulent gas flow to remove heat from the GFR core can be impaired by either a buoyancy effect or an acceleration effect. These phenomena lead …
-
Nucleation during boiling, with special reference to its cessation at low pressure
A critical review of the mechanisms, models and heat-transfer correlations for nucleate boiling is presented. The importance of nucleation is stressed. It is pointed out that the bulk of correlations are based on the erroneous notion that the energy transferred away from the heating surface by …
-
Application of Digital Filtering Methods to State and Parameter Estimation in Process Plant
… double effect evaporator is derived along with heat transfer correlations that are suitable for implementation within the Kalman Filter. Finally a computer package is developed, which incorporates an adaptive filter, for on-line estimation of the state and parameters of a chemical process. The …
-
A frequency domain analysis of surface heat transfer/free-stream turbulence interactions in a transonic turbine cascade
The relationship of time-resolved surface heat flux to the turbulent free-stream flow over a turbine blade is investigated. Measurements are made in a transonic linear cascade with a modem high pressure turbine blade profile. Time-resolved direct heat transfer measurements are made with Heat Flux …
-
MULTIDISCIPLINARY OPTIMIZATION OF NON-SPHERICAL, BLUNT-BODY HEAT SHIELDS FOR A PLANETARY ENTRY VEHICLE
… static stability, and stagnation-point heat transfer has been completed to find optimal heat shield geometries for blunt-body planetary entry vehicles. In the parametric study, performance trends have been identified by varying geometric parameters that define a range of cross-sections …
-
Validation of a CFD Approach for Gas Turbine Internal Cooling Passage Heat Transfer Prediction
… the identification of particular shortcomings of heat transfer correlations and provides a baseline for future CFD based exploration of internal turbine cooling concepts.</p>
-
Numerical Investigations of Thermal-Fluid Phenomena Across Emerging Energy Systems
… with emphasis on predictive modeling and heat transfer behavior under extreme or highly variable conditions. The first portion of the work focuses on supercritical carbon dioxide (sCO<sub>2</sub>), a working fluid of increasing importance in advanced power and refrigeration cycles. A …
-
Development of An Adaptive Kalman Filter for Estimation in Chemical Plant.
… model of the evaporator, together with suitable heat transfer correlations and compatible with the Kalman Filter, was derived and then tested by comparing the simulated responses with plant data. Secondly, two major software packages were developed: (i) The Hadios Executive Package, which was …
-
An experimental investigation of heat transfer to hydrogen peroxide in microtubes
… to the cooling scheme. To address this issue, heat transfer experiments in 95 [mu]m inside diameter, 4 mm long, electrically heated stainless steel microtubes have been performed to define the stability limit and explosion condition associated with 98% hydrogen peroxide thermal decomposition. …
-
Flow and Heat Transfer in Microchannels 30 to 300 Microns in Hydraulic Diameter
Fluid flow and heat transfer in microchannels are very important in various fields, including miniature thermal systems, compact heat exchangers and electronics cooling. The purpose of this investigation is to contribute to this new research area through carefully designed and well controlled …
-
Membrane based dehumidification and evaporative cooling using wire mesh media
… the aim of this work is to investigate the heat and mass transfer performance of several different wire mesh media in membrane based dehumidification and evaporative cooling. There were six wire mesh membranes tested in an experimental facility. The wire mesh membranes vary with respect to …
-
On the Local Heat Transfer Behavior of Supercritical Carbon Dioxide
<p>A detailed study of the local heat transfer behavior of supercritical carbon dioxide (sCO2) is performed. Flows relevant to heat transfer devices, such as sCO2 heaters, recuperators, and internally cooled turbine blades are studied, with particular attention paid to data reduction methodology, …
-
Total Temperature Probe Performance for Subsonic Flows using Mixed Fidelity Modeling
… of conduction, convection, and radiation heat transfer between the sensor, fluid and the surroundings due to large thermal gradients present in real turbomachinery systems. While these effects have been previously investigated, the available design models are very limited to specific …
-
Dynamics of nanoparticle combustion
… was also measured using the shock tube to heat the particles to known temperatures. The burning time and peak particle temperature results suggested that heat transfer models currently used for burning nanoparticles may significantly overestimate heat losses during combustion. By applying …
-
Numerical investigation into the effects of multiple bubbles in microchannel flow boiling
… in microelectronics have produced higher heat fluxes that are beyond the capabilities of current heat exchangers. An increase in computing power coupled with decreasing processor size requires high thermal management on a smaller contact area. Microchannel heat sinks utilising flow boiling …
-
Flow boiling of R134a in vertical mini-diameter tubes
… project devoted to investigate flow boiling heat transfer, pressure drop and flow visualization of R134a in small to mini/micro-diameter tubes. The experimental facility was first designed and constructed by X. Huo (2005) with the contribution of L. Chen (2006). In the present study, the …
-
Effects of flow orientation on condensation in tubes
<p>This study explores the interfacial and heat transfer characteristics of annular condensation of FC-72 in vertical downflow, vertical upflow and horizontal flow as well as the effects of channel orientation on flow condensation. Two separate condensation test modules are employed, one for …
-
A new experimental approach of characterizing two-phase flow and heat transfer in plate heat exchangers
Heat transfer of two-phase flow is not well characterized for plate heat exchangers (PHEs) despite their wide applications. No general correlations in the public domain are capable of accounting for all different effects of geometrical parameters, working fluids and operating conditions. The …
Page 1 of 2