Comparison of GEP and ANN Method with Experimental Data to Forecast the Laminar Fluid Stream and Heat Transmission Characteristics Through a Tube with Spiral Ribs and Twisted Tapes

2020 ◽  
pp. 81-95
Author(s):  
Sagnik Pal ◽  
Sameer S. Gajghate ◽  
Swapan Bhaumik
Keyword(s):  
Experimental Data ◽  
Heat Transmission ◽  
Transmission Characteristics ◽  
Fluid Stream ◽  
Twisted Tapes

scholarly journals Network model for thermal conductivities of unidirectional fiber-reinforced composites

2014 ◽  
Vol 32 (4) ◽  
pp. 533-540
Author(s):  
Yang Wang ◽  
Chaoyi Peng ◽  
Weihua Zhang
Keyword(s):  
Network Model ◽  
Fiber Reinforced Composites ◽  
Analytical Models ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Heat Transmission ◽  
Transmission Characteristics ◽  
Unidirectional Fiber ◽  
Good Agreement ◽  
Thermal Conductivities

AbstractAn empirical network model has been developed to predict the in-plane thermal conductivities along arbitrary directions for unidirectional fiber-reinforced composites lamina. Measurements of thermal conductivities along different orientations were carried out. Good agreement was observed between values predicted by the network model and the experimental data; compared with the established analytical models, the newly proposed network model could give values with higher precision. Therefore, this network model is helpful to get a wider and more comprehensive understanding of heat transmission characteristics of fiber-reinforced composites and can be utilized as guidance to design and fabricate laminated composites with specific directional or specific locational thermal conductivities for structures that simultaneously perform mechanical and thermal functions, i.e. multifunctional structures (MFS).

Research on Adaptive Load Sharing Control for Multi-Motor Synchronous Driving System of Shield Machine

2014 ◽  
Vol 667 ◽  
pp. 417-420 ◽  
Author(s):  
Ran Liu ◽  
Da Yong Yu ◽  
Wen Gang Zhao ◽  
Wei Dong Li ◽  
Jian Zhong Sun
Keyword(s):  
Experimental Data ◽  
Mutation Load ◽  
Transmission Characteristics ◽  
Synchronization System ◽  
Linear Coupling ◽  
Driving System ◽  
Mathematic Modeling ◽  
Electric Driving ◽  
System Synchronization ◽  
Shield Machine

This paper presents an adaptable controlling approach on account of the mathematic modeling and the quantitative analysis of experimental data on a ring-coupling controlling structure. It is based on the research of transmission characteristics of non-linear coupling gear rotation in main electric-driving system of cutterhead, and it is aimed at reducing the deviation of system synchronization caused by the mutation load, and improving the compliance capability of multi-motor synchronization system.

Thermal Diffusivity Measurement in Solids by means of the Photoacoustic Technique

2009 ◽  
Vol 1242 ◽  
Author(s):  
José B. Rojas-Trigos ◽  
A. Calderón ◽  
E. Marín
Keyword(s):  
Experimental Data ◽  
Gallium Arsenide ◽  
Thermal Diffusivity ◽  
Heat Source ◽  
Photoacoustic Technique ◽  
Heat Transmission ◽  
Thermal Diffusivity Measurement ◽  
Model Based ◽  
Diffusivity Measurement ◽  
Diffusivity Measurements

ABSTRACTWe report thermal diffusivity measurements for samples of silicon, gallium arsenide and cupper by means of the photoacoustic technique in a heat transmission configuration in order to obtain a comparison between the results obtained with the use of the conventional RG-model and our SP-model (based in a square periodical heat source) in the fitting process to the experimental data. Our results show that our SP-model is accurate to obtain a good fitting with the experimental data and it improves notably the results obtained with the RG-model.

Enhancement of Thermohydraulic Performance of Turbulent Flow in Rectangular and Square Ribbed Ducts With Twisted-Tape Inserts

2008 ◽  
Vol 130 (8) ◽  
Author(s):  
Ashis K. Mazumder ◽  
Sujoy K. Saha
Keyword(s):  
Experimental Data ◽  
Turbulent Flow ◽  
Boundary Layer Separation ◽  
Swirl Flow ◽  
Short Length ◽  
Full Length ◽  
Twisted Tape ◽  
Flow Recirculation ◽  
Twisted Tapes ◽  
Better Than

The thermohydraulic performance of turbulent flow of air through rectangular and square ribbed ducts with twisted-tape inserts has been experimentally studied. The performance is influenced by the twisted-tape-generated swirl flow and the boundary layer separation, reattachment, and flow recirculation due to the ribs. Correlations developed for friction factor and Nusselt number satisfactorily predict the experimental data. The performance of the ribbed ducts with full-length twisted-tape inserts is found to be better than only ribbed ducts and ducts with only twisted-tape inserts. The regularly spaced twisted-tape elements in specific cases significantly perform better than their full-length counterparts. However, the short-length twisted-tape performance is worse than the full-length twisted tapes.

Microdiffraction Patterns of Small Metallic Particles II; Theoretical Analysis

1982 ◽  
Vol 40 ◽  
pp. 668-669
Author(s):  
A. Gómez ◽  
P. Schabes-Retchkiman ◽  
M. José-Yacamán ◽  
T. Ocaña
Keyword(s):  
Experimental Data ◽  
Electron Diffraction ◽  
Theoretical Analysis ◽  
Size Range ◽  
Dynamical Theory ◽  
Metallic Particles ◽  
Splitting Effect

The splitting effect that is observed in microdiffraction pat-terns of small metallic particles in the size range 50-500 Å can be understood using the dynamical theory of electron diffraction for the case of a crystal containing a finite wedge. For the experimental data we refer to part I of this work in these proceedings.

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