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Enhancing thermal performance of heat pipe based solar thermal collector

Alammar, Ahmed Ali Ghulfus (2018)
Ph.D. thesis, University of Birmingham.

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Abstract

In this work, a CFD model was developed to simulate the flow and phase-change process inside the Two-Phase Closed Thermosyphon (TPCT). This was carried out to investigate the effect of fill ratio and inclination angle on the thermal performance of the TPCT, and to visualise the phase change characteristics under the influence of the inclination and different fill ratios. Also, the surface wettability in terms of the contact angle was investigated to report their effect on the thermal characteristics of the TPCT and to visualise the phase-change characteristics inside the TPCT for different contact angles using Fluent Ansys. Furthermore, the effect of different parameters on the geyser boiling in the TPCT was investigated experimentally. Consequently, the influence of geyser effect on the TPCT thermal characteristics was examined under the effect of various liquid charges and inclination angles at a broad range of heat inputs. Finally, advanced manufacturing technique using wire Electrical Discharge Machining (EDM) was employed to introduce a surface roughness in the TPCT internal wall, thereby enhancing the thermal performance of the TPCT. This was achieved by comparing its thermal performance with a plain TPCT at two different initial sub-atmospheric pressures (3 and 30 kPa) and different heat loads.

Type of Work:Ph.D. thesis.
Supervisor(s):Al-Dadah, Raya and Mahmoud, Saad
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Mechanical Engineering
Additional Information:

Publications arising from thesis:

Alammar, A.A., Al-Dadah, R.K. & Mahmoud, S.M., 2016. Numerical investigation of effect of fill ratio and inclination angle on a thermosiphon heat pipe thermal performance. Applied Thermal Engineering, 108, pp.1055–1065.
http://dx.doi.org/10.1016/j.applthermaleng.2016.07.163

Alammar, A.A., Al-Dadah, R.K. & Mahmoud, S.M., 2018. Effect of inclination angle and fill ratio on geyser boiling phenomena in a two-phase closed thermosiphon –
Experimental investigation. Energy Conversion and Management, 156 (October 2017), pp.150–166.
http://dx.doi.org/10.1016/j.enconman.2017.11.003

Alammar, A.A., Al-Dadah, R.K. & Mahmoud, S.M., 2017. Experimental investigation of the influence of the geyser boiling phenomenon on the thermal performance of a twophase closed thermosyphon. Journal of Cleaner Production, 172, pp.2531–2543.
http://dx.doi.org/10.1016/j.jclepro.2017.11.157

A. A. Alammar, F. N. Al-Mousawi, R. K. Al-Dadah, S. M. Mahmoud, and R. Hood, “Enhancing Thermal performance of a Two-phase Closed Thermosyphon With an Internal
Surface Roughness,” Journal of Cleaner Production., 2018.
http://dx.doi.org/10.1016/j.jclepro.2018.03.020

Subjects:TJ Mechanical engineering and machinery
Institution:University of Birmingham
ID Code:8207
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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