Searched for: subject:"heat%5C+transfer"
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Rasooli, A. (author)
Accurate determination of building’s critical thermo-physical characteristics such as the walls’ thermal resistance, thermal conductivity, and volumetric heat capacity is essential to indicate effective and efficient energy conservation strategies at building level. In practice, the values of these parameters, which determine not only possible...
doctoral thesis 2020
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Ataei Dadavi, I. (author)
In the chain of steel production, the blast furnace converts iron ore into liquid iron. The hearth of the blast furnace, where the liquid metal is collected and tapped off, is filled with relatively large coke particles (D ~ 20 – 100 mm). The meandering flow of hot liquid metal in the coarse-grained porous medium in the hearth causes erosion of...
doctoral thesis 2020
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Çelik, M. (author)
Steel is an indispensable material for the sustainable maintenance and progress of modern civilization. Its versatility in terms of mechanical and thermal characteristics, corrosion resistance, raw material availability, energy consumption and recyclability provides a clear advantage in a fast-changing technological landscape. In order to adapt...
doctoral thesis 2020
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Tao, X. (author), Dahlgren, Elias (author), Leichsenring, Maaike (author), Infante Ferreira, C.A. (author)
This paper investigates NH<sub>3</sub> condensation in a plate heat exchanger by visualizing the flow patterns and measuring heat transfer coefficients and frictional pressure drop. Visualization experiments were conducted between 20 and 100 kgm<sup>−2</sup>s<sup>−1</sup>. Full film flow takes place at large mass fluxes and intermediate mass...
journal article 2020
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Chakkingal, M. (author), Kenjeres, S. (author), Ataei Dadavi, I. (author), Tummers, M.J. (author), Kleijn, C.R. (author)
We report numerical simulations of natural convection and conjugate heat transfer in a differentially heated cubical cavity packed with relatively large hydrogel beads (d/L=0.2) in a Simple Cubic Packing configuration. We study the influence of a spatially non-uniform, sinusoidally varying, wall temperature on the local flow and heat transfer...
journal article 2020
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Tao, X. (author), Infante Ferreira, C.A. (author)
This paper develops predicting models for NH<sub>3</sub> condensation in plate heat exchangers based on the experiments of flow patterns, heat transfer coefficients and frictional pressure drop previously reported by the authors. The aim is to provide design methods of compact plate condensers used in NH<sub>3</sub> systems, which are not...
journal article 2020
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Aminian, Ehsan (author), Moghadasi, Hesam (author), Saffari, Hamid (author), Mirza Gheytaghi, Amir (author)
Corrugating channel wall is considered to be an efficient procedure for achieving improved heat transfer. Further enhancement can be obtained through the utilization of nanofluids and porous media with high thermal conductivity. This paper presents the effect of geometrical parameters for the determination of an appropriate configuration....
journal article 2020
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Hosseinimehr, S. (author), Vuik, Cornelis (author), Hajibeygi, H. (author)
An algebraic dynamic multilevel (ADM) method for fully-coupled simulation of flow and heat transport in heterogeneous fractured geothermal reservoirs is presented. Fractures are modeled explicitly using the projection-based embedded discrete method (pEDFM), which accurately represents fractures with generic conductivity values, from barriers to...
journal article 2020
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Cascioli, E. (author), Buckingham, S. (author), Keijers, S. (author), Tichelen, K. Van (author), Kenjeres, S. (author)
In the present work, we combine experiments and numerical simulations of a planar jet with heated co-flow with medium (air) and low-Prandtl (He-Xe gas mixture) fluids. Jets are recognized as representative test cases to be investigated in large components of pool-type liquid metal-cooled nuclear systems, like the Multi-purpose hYbrid Research...
journal article 2020
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Kenjeres, S. (author), Fornalik-Wajs, E. (author), Wrobel, W. (author), Szmyd, J. S. (author)
The present study addresses the detailed numerical analysis of the flow and heat transfer of a paramagnetic fluid inside a differentially heated cubical box and subjected to a strong non-uniform magnetic field. Two different heating scenarios are considered regarding an initial thermal stratification: unstable (heated from the bottom) and...
journal article 2020
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Ranjan, R. (author), Ayas, C. (author), Langelaar, M. (author), van Keulen, A. (author)
The powder bed fusion (PBF) process is a type of Additive Manufacturing (AM) technique which enables fabrication of highly complex geometries with unprecedented design freedom. However, PBF still suffers from manufacturing constraints which, if overlooked, can cause various types of defects in the final part. One such constraint is the local...
journal article 2020
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Ataei Dadavi, I. (author), Chakkingal, M. (author), Kenjeres, S. (author), Kleijn, C.R. (author), Tummers, M.J. (author)
This paper reports on an experimental study of mixed convection flow and heat transfer in a vented, differentially side-heated cubical cavity filled with a porous medium consisting of relatively large solid low-conductivity spheres. Rayleigh numbers and Reynolds numbers are varied over the ranges 6 × 10<sup>6</sup> &lt; Ra &lt; 7 × 10<sup>7<...
journal article 2020
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Silvestri, S. (author), Pecnik, R. (author)
We implemented a fast Reciprocal Monte Carlo algorithm to accurately solve radiative heat transfer in turbulent flows of non-grey participating media that can be coupled to fully resolved turbulent flows, namely to Direct Numerical Simulation (DNS). The spectrally varying absorption coefficient is treated in a narrow-band fashion with a...
journal article 2019
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Peeters, J.W.R. (author), Rohde, M. (author)
A new friction-heat transfer analogy for the prediction of heat transfer to turbulent fluids at supercritical pressure is presented. This analogy is based on the observation that the predominent events that determine the turbulent heat flux known as hot ejections and cold sweeps have different thermophysical properties. This observation is...
journal article 2019
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Rasooli, A. (author), Itard, L.C.M. (author)
Accurate determination of walls' thermo-physical characteristics is a necessity for execution of energy conservation strategies in existing buildings. In practice, such data is not available because the current determination methods are time expensive and therefore rarely used. Based on the theory of Response Factors, a rapid transient in...
journal article 2019
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Tao, X. (author), Infante Ferreira, C.A. (author)
The corrugation channels of plate heat exchangers enhance the heat transfer and complicate the prediction of heat transfer coefficients and frictional pressure drop. This paper reviews the heat transfer and frictional pressure drop correlations for condensation in plate heat exchangers, and classifies the correlations into basic forms. An...
review 2019
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Hussien, Ahmed A. (author), Abdullah, Mohd Z. (author), Yusop, Nadiahnor Md (author), Al-Kouz, Wael (author), Mahmoudi, Ebrahim (author), Mehrali, M. (author)
Massive improvements in the thermophysical properties of nanofluids over conventional fluids have led to the rapid evolution of using multiwalled carbon nanotubes (MWCNTs) and graphene nanoplatelets (GNPs) in the field of heat transfer. In this study, the heat transfer and entropy generation abilities of MWCNTs/GNPs hybrid nanofluids were...
journal article 2019
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Luna-Triguero, Azahara (author), Sławek, A. (author), Huinink, H.P. (author), Vlugt, T.J.H. (author), Poursaeidesfahani, A. (author), Vicent-Luna, J.M. (author), Calero, S. (author)
According to the European Commission, in 2016 the residential sector represented 25.4% of the final energy consumption. Heating and cooling in EU households account for 69.1% of the total energy consumption. The fraction of 84% for heating and cooling is still generated from fossil fuels, and only 16% is generated from renewable energy. To...
journal article 2019
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Ataei Dadavi, I. (author), Chakkingal, M. (author), Kenjeres, S. (author), Kleijn, C.R. (author), Tummers, M.J. (author)
This paper reports on an experimental study of natural convection in an enclosure that is heated at the bottom and cooled at the top, filled with a packed bed of relatively large solid spheres. Nusselt numbers were measured for various sphere conductivities, spheres sizes and sphere packings for Rayleigh numbers varying between 10<sup>7</sup>...
journal article 2019
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Peeters, J.W.R. (author), Sandham, N. D. (author)
It is well known that rough surfaces affect turbulent flows significantly. How such surfaces affect turbulent heat transfer is less well understood. To gain more insight, we have performed a series of direct numerical simulations of turbulent heat transfer in a channel flow with grit-blasted surfaces. An immersed boundary method is used to...
journal article 2019
Searched for: subject:"heat%5C+transfer"
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