Thermal radiation transport in a fluidized dry water system

Date

2013-05-01

Author

Taylan, Onur
Berberoglu, Halil

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

108
views

0
downloads

This paper reports a numerical study on thermal radiation transport in a novel material called dry water. Dry water is a water-in-air inverse foam which consists of micrometer-sized water droplets encapsulated by hydrophobic fumed-silica nanoparticles. First, the size distribution of dry water was measured using a particle size analyzer. Then, the radiation characteristics of dry water were obtained using the Mie theory for coated spheres. One-dimensional, steady radiative transport in fluidized dry water system was modeled using the radiative transport equation (RTE) and was solved spectrally with the discrete ordinates method. The effects of silica coating and water droplet size as well as the volume fraction of dry water particles on reducing radiative heat transfer were studied parametrically. The results obtained using the size distributions from experimental measurements at a volume fraction of 10(-4) showed that dry water reduced the local radiative heat flux by more than 60% with respect to that by silica particles alone whereas its performance was comparable to that of fine water mists. Moreover, reduction of the diameter of dry water particles from 150 to 50 mu m and increasing their volume fraction from 10(-4) to 10(-3) decreased the radiative heat flux by 45% and 67%, respectively. Dry water is a novel and unique material that does not require high pressure fluid lines for producing fine mists and features a silica shell that can serve to encapsulate water soluble compounds, retard water evaporation from the core as well as increase scattering. With these unique features, dry water finds diverse engineering applications serving as a base for photo-catalytic nanoreactors, gas and chemical storage and delivery systems, as well as alternative mist systems in firefighting. (C) 2013 Elsevier Ltd. All rights reserved.

URI

https://hdl.handle.net/11511/89360

Journal

JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER

DOI

https://doi.org/10.1016/j.jqsrt.2013.01.005

Collections

Department of Mechanical Engineering, Article

Suggestions

OpenMETU
Core

Thermal Radiation Transport in a Cloud of Dry Water Particles Taylan, Onur; Berberoglu, Halil (2013-07-24) This paper reports a numerical study on the thermal radiative transport in a cloud of dry water particles. Dry water is a water-in-air inverse foam which consists of micrometer-sized water droplets encapsulated by hydrophobic fumed-silica nanoparticles. The radiative properties of this novel material were estimated using the Mie theory for coated spheres. The radiative transport equation (RTE) was solved for a one-dimensional geometry using the discrete ordinates method. The effects of silica particle and w...
Thermal transmittance assessment of building walls by using in-situ infrared thermography Sayın, Murat; Tavukçuoğlu, Ayşe; Department of Building Science in Architecture (2019) The main concerns of the study are the thermal transmittance (U, Wm-2K-1) assessment of building walls by quantitative analyses of surface temperature data obtained by infrared thermography (IRT) and the identification of thermal failure types in terms of measurable parameters. Mainly six types of non-insulated and insulated wall compositions belonging to three different buildings were examined. The actual thermal performances of the walls (UINSITU) determined with in-situ quantitative IRT (QIRT) was assess...
Induction thermal plasma synthesis of Mg2Ni nanoparticles Aktekin, Burak; ÇAKMAK, GÜLHAN; Öztürk, Tayfur (2014-06-15) A study was carried out into possibility of thermal plasma synthesis of Mg2Ni nanoparticles. Both prealloyed powders and elemental powders were used as precursors in an inductively coupled thermal plasma incorporating two injection probes located axially in the reactor one from the top and the other from the bottom. The study has shown that the use of prealloyed Mg2Ni as precursor leads to its disintegration in the plasma condensing into separate phases and therefore was not suitable for the synthesis of Mg...
Thermal characterization and model-free kinetics of biodiesel sample Kök, Mustafa Verşan (2015-11-01) In this study, combustion and pyrolysis behaviours of methanol route biodiesel were investigated using thermal analysis techniques known as simultaneous thermogravimetry and differential scanning calorimetry (DSC) at different heating rates. Reaction regions, peak temperatures, mass loss and heat flow rates of the biodiesel sample are determined using TG-DTG and DSC data. It was found that as the heating rate of the reactions increased, peak temperatures of the reactions shifted higher temperatures, implyin...
Uncertainty quantification by using stochastic approach in pore volume calculation for geothermal reservoir Gürel, Emrah; Akın, Serhat; Department of Petroleum and Natural Gas Engineering (2015) This study will present the application of a stochastic approach and experimental design techniques to a geologic system in order to quantify the uncertainty of pore volume estimations for a liquid dominated high temperature geothermal reservoir. The pore volume is a key element when defining the total resource available in the field. Alasehir geothermal reservoir pore volume uncertainty has been assessed. The uncertainties being addressed include geometry (top of reservoir and base of reservoir), reservoir...

Citation Formats

O. Taylan and H. Berberoglu, “Thermal radiation transport in a fluidized dry water system,” JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER, pp. 104–113, 2013, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/89360.