research centers


Search results: Found 2

Listing 1 - 2 of 2
Sort by

Article
Thermally Developing Forced Convection in a Horizontal Equilateral Triangular Channel
انتقال الح ا ررة بالحمل القسري لجريان متطور ح ا ررياً في قناة أفقية مثلثة متساوية الأضلاع

Authors: Manar Salih Mahdi --- Tahseen Ahmad Tahseen --- Adnan Mohamed Hussein
Journal: Tikrit Journal of Engineering Sciences مجلة تكريت للعلوم الهندسية ISSN: 1813162X 23127589 Year: 2012 Volume: 19 Issue: 3 Pages: 58-67
Publisher: Tikrit University جامعة تكريت

Loading...
Loading...
Abstract

An experimental investigation was carried out to study thermally developing fully developed laminar forced convection in a horizontal equilateral triangular channel where the channel surface was heated uniformly. The channel length was (1.5 m) long and constructed from three plane (100 mm) walls to form the equilateral triangular crosssection. The experiments were conducted for three mass flow rates (1.91×10-3, 2.54×10-3 and 3.03×10-3 kg/s) and four heat fluxes (91, 171, 272 and 406 W/m2). Reynolds number range was (1198  Re 1988). It was found that local Nusselt number increasing as the heat fluxes and the mass flow rate increased. Also it was found that the greatest local Nusselt number value was in the beginning of the channel then it decreased accompanied by growing the thermal boundary layer along the channel. Present experimental results have a good agreement with previous results obtained for similarly configured channels.


Article
Hybrid CFD-ANN Scheme for Air Flow and Heat Transfer Across In-Line Flat Tubes Array

Authors: Tahseen Ahmad Tahseen --- M. Ishak --- Khalaf Ibrahim Hamada --- M.M. Rahman --- et al.
Journal: Tikrit Journal of Engineering Sciences مجلة تكريت للعلوم الهندسية ISSN: 1813162X 23127589 Year: 2018 Volume: 25 Issue: 2 Pages: 59-67
Publisher: Tikrit University جامعة تكريت

Loading...
Loading...
Abstract

Flat tubes are vital components of various technical applications including modern heat exchangers, thermal power plants, and automotive radiators. This paper presents the hybridization of computational fluid dynamic (CFD) and artificial neural network (ANN) approach to predict the thermal-hydraulic characteristics of in-line flat tubes heat exchangers. A 2D steady state and an incompressible laminar flow in a tube configuration are considered for numerical analysis. Finite volume technique and body-fitted coordinate system are used to solve the Navier–Stokes and energy equations. The Reynolds number based on outer hydraulic diameter varies between 10 and 320. Heat transfer coefficient and friction are analyzed for various tube configurations including transverse and longitudinal pitches. The numerical results from CFD analysis are used in the training and testing of the ANN for predicting thermal characteristics and friction factors. The predicted results revealed a satisfactory performance, with the mean relative error ranging from 0.39% to 5.57%, the root-mean-square error ranging from 0.00367 to 0.219, and the correlation coefficient (R2) ranging from 99.505% to 99.947%. Thus, this study verifies the effectiveness of using ANN in predicting the performance of thermal-hydraulic systems in engineering applications such as heat transfer modeling and fluid flow in tube bank heat exchangers.

Listing 1 - 2 of 2
Sort by
Narrow your search

Resource type

article (2)


Language

English (2)


Year
From To Submit

2018 (1)

2012 (1)