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Convective bubbly flow ofwater in an annular pipe: Role of total dissolved solids on heat transfer characteristics and bubble formation

Sarafraz, M.M., Shadloo, M.S., Tian, Z., Tlili, I., Alkanhal, T.A., Safaei, M.R., Goodarzi, M. and Arjomandi, M. 2019, Convective bubbly flow ofwater in an annular pipe: Role of total dissolved solids on heat transfer characteristics and bubble formation, Water, vol. 11, no. 8, pp. 1-16, doi: 10.3390/w11081566.

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Title Convective bubbly flow ofwater in an annular pipe: Role of total dissolved solids on heat transfer characteristics and bubble formation
Author(s) Sarafraz, M.M.ORCID iD for Sarafraz, M.M. orcid.org/0000-0002-6347-0216
Shadloo, M.S.
Tian, Z.
Tlili, I.
Alkanhal, T.A.
Safaei, M.R.
Goodarzi, M.
Arjomandi, M.
Journal name Water
Volume number 11
Issue number 8
Article ID 1566
Start page 1
End page 16
Total pages 16
Publisher MDPI
Place of publication Basel, Switzerland
Publication date 2019
ISSN 2073-4441
Keyword(s) Science & Technology
Physical Sciences
Water Resources
contact angle
annulus pipe
bubble formation
radial heat flux
total dissolved solid material
convective flow
TRANSFER ENHANCEMENT
PRESSURE-DROP
VERTICAL TUBE
VAPOR BUBBLES
2-PHASE FLOW
MASS FLUX
FILM
DYNAMICS
GROWTH
ANGLE
Summary Formation of bubbles in water inside an annulus pipe in a flow boiling regime was experimentally investigated. The effect of various variables, such as total dissolved solid materials (TDS) in terms of mass fraction, flow rate of water, and applied heat flux (HF) on the heat transfer coefficient (HTC) and bubble behavior of water, was experimentally investigated. A regression formula was fitted to estimate the average bubble diameter at various TDS values, with accuracy of <4.1% up to heat flux of 90 kW/m2. Results show that the presence of TDS materials can increase the contact angle of bubble and bubble diameter, and also promotes the HTC value of the system. However, flow rate of water suppressed bubble generation, and increased the heat transfer coefficient due to the renewal of the thermal boundary layer around the boiling surface. Likewise, it was identified that forced convective and nucleate boiling heat transfer mechanisms contribute to the flow of boiling water, and heat flux is a key parameter in determining the mechanism of heat transfer. In the present study, heat flux of 15 kW/m2 at 50 °C was the heat flux in which onset of nucleate boiling was identified inside the annulus pipe. The contact angle of water at TDS values of 300 mg/L and 1200 mg/L was 74° and 124°, respectively, showing the improvement in heat transfer characteristics of water due to the presence of TDS materials.
Language eng
DOI 10.3390/w11081566
Indigenous content off
HERDC Research category C1.1 Refereed article in a scholarly journal
Free to Read? Yes
Persistent URL http://hdl.handle.net/10536/DRO/DU:30142864

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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.