elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Phase state and velocity measurements with high temporal and spatial resolution during melting of n-octadecane in a rectangular enclosure with two heated vertical sides

Vogel, Julian and Bauer, Dan (2018) Phase state and velocity measurements with high temporal and spatial resolution during melting of n-octadecane in a rectangular enclosure with two heated vertical sides. International Journal of Heat and Mass Transfer, 127 (A), pp. 1264-1276. Elsevier. DOI: 10.1016/j.ijheatmasstransfer.2018.06.084 ISSN 0017-9310

[img] PDF - Registered users only until 1 August 2021
1MB

Abstract

A novel validation experiment for the melting of a phase change material is presented. The goal is to measure phase state and velocities with high accuracy and resolution. The geometry and boundary conditions of the test section are the most generic found in latent heat storage systems: a phase change material is contained in a rectangular enclosure, where it is isothermally heated from two opposing vertical side walls. The enclosure has a height of 105 mm and a width and depth of 50 mm. The bottom, front and back sides are solid transparent walls and on top is a thin layer of air. Near-adiabatic boundary conditions are realized at the non-heated sides with a surrounding insulated air-filled chamber and an actively controlled trace heating system. In this study n-octadecane is used as the phase change material. During melting, the liquid phase fraction is measured with a shadowgraph technique and velocities due to natural convection in the liquid phase are measured with particle image velocimetry (PIV). Interior and boundary temperatures are measured with thermocouples to control and analyze boundary effects. A thorough error estimation is done for all the measured quantities. The main result is a comprehensive dataset of liquid phase fractions and velocities with high spatial and temporal resolutions. The liquid phase fraction is additionally measured for three different driving temperature differences and a scaling by dimensionless numbers is performed. This results in a correlation function for the liquid phase fraction that predicts similar melting processes and is valuable in system design and optimization.

Item URL in elib:https://elib.dlr.de/121071/
Document Type:Article
Title:Phase state and velocity measurements with high temporal and spatial resolution during melting of n-octadecane in a rectangular enclosure with two heated vertical sides
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Vogel, Julianjulian.vogel (at) dlr.dehttps://orcid.org/0000-0001-9792-2332
Bauer, DanDan.Bauer (at) dlr.deUNSPECIFIED
Date:December 2018
Journal or Publication Title:International Journal of Heat and Mass Transfer
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:127
DOI :10.1016/j.ijheatmasstransfer.2018.06.084
Page Range:pp. 1264-1276
Publisher:Elsevier
ISSN:0017-9310
Status:Published
Keywords:Latent heat thermal energy storage, Phase change material (PCM), Natural convection, Particle image velocimetry (PIV), Validation experiment
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Thermal Energy Storage
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Thermochemical Processes (Storage)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Vogel, Julian
Deposited On:07 Sep 2018 13:44
Last Modified:06 Sep 2019 15:16

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.