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Numerical and Experimental Investigation on Pool Boiling Heat Transfer Performance Using Nanofluids.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Numerical and Experimental Investigation on Pool Boiling Heat Transfer Performance Using Nanofluids./
Author:	Kamel, Mohammed Saad.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
Description:	140 p.
Notes:	Source: Dissertations Abstracts International, Volume: 82-12, Section: B.
Contained By:	Dissertations Abstracts International82-12B.
Subject:	Heat transfer. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28680000
ISBN:	9798516953040

Numerical and Experimental Investigation on Pool Boiling Heat Transfer Performance Using Nanofluids.
Kamel, Mohammed Saad.

Numerical and Experimental Investigation on Pool Boiling Heat Transfer Performance Using Nanofluids. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 140 p.

Source: Dissertations Abstracts International, Volume: 82-12, Section: B.

Thesis (Ph.D.)--Budapest University of Technology and Economics (Hungary), 2020.

This item must not be sold to any third party vendors.

In many heat exchange systems, boiling heat transfer play a significant role in transferring heat from one medium to another. Boiling heat transfer is an efficient heat transfer mode among others, and this is due to the latent heat of vaporization during the boiling phase change phenomenon. The nucleate boiling regime involved in many industrial applications to remove high heat flux in relatively small superheat temperature, which, in turn, makes these systems more durable and efficient. Adequate cooling fluids are needed to pass high heat flux from a heating surface to the fluid by applying the smallest temperature difference per unit time and area in the solid surface during boiling phase change. Nanofluids are engineered colloids or suspensions, which are produced by dispersing nanoscale solid materials such as metallic, nonmetallic, and carbon into conventional liquids such as water, oil, ethylene, tri-ethylene-glycols, polymeric solutions, and refrigerants to enhance thermal transport properties. In the present research, the pool boiling heat transfer performance of deionized water and different types of nanofluids from a horizontal heated copper typical tube at atmospheric pressure condition was investigated. Firstly, the boiling model under the Eulerian-Eulerian multiphase model was corrected and extended to mimic the pool boiling heat transfer from different heating element geometries. The commercial computational fluid dynamics CFD code using build-in functions and additional user-defined functions UDFs related to nucleate boiling parameters of silica nanofluids was used to investigate pool boiling behavior from flat plate heating element. Afterward, the corrected model by modifying the bubble waiting time coefficient in quenching heat flux partition was used to validate and predict the pool boiling heat transfer of ceria nanofluids from a horizontal heated tube at atmospheric pressure. Next, an experimental setup was designed, fabricated and collected for validation of the numerical results of ceria nanofluids and also to investigate the pool boiling heat transfer performance of other types of nanofluid from a typical horizontal heated copper tube with an outer diameter (22 mm). Before the test of nanofluids for pool boiling performance, the thermal conductivity of deionized water and various nanofluids was measured by the transient plate source sensor at different volume concentrations and temperatures. The two-step method was utilized to prepare our mono and hybrid nanofluids and the stability of the nanofluids was checked to confirm the applicability of using those nanofluids in the current tests. The results demonstrated that the thermal conductivity of prepared nanofluids was enhanced compared to deionized water as a baseline case, and this enhancement was increased with increasing the volume concentrations and temperatures. The obtained results regarding the pool boiling tests showed that using nanofluids as working fluids in the pool boiling heat transfer process might reduce or enhance the pool boiling heat transfer coefficient. The pool boiling heat transfer coefficient enhancement ratio of nanofluids relative to deionized water was improved or deteriorated depends on the nanomaterials type, size, concentrations and the heating surface characteristics. Moreover, a new kind of nanofluids so-called hybrid nanofluids which are produced by adding complex nanopowders (hybrid ones) or by mixing two different nanofluids were prepared to investigate the pool boiling behavior in the current research. Results have shown that the pool boiling heat transfer performance was enhanced for both types of hybrid nanofluids that are used for pool boiling tests when using dilute volume concentrations.

ISBN: 9798516953040Subjects--Topical Terms:

3391367
Heat transfer.
Subjects--Index Terms:

Pool boiling

Numerical and Experimental Investigation on Pool Boiling Heat Transfer Performance Using Nanofluids.
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245 1 0 $a Numerical and Experimental Investigation on Pool Boiling Heat Transfer Performance Using Nanofluids.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2020
300 $a 140 p.
500 $a Source: Dissertations Abstracts International, Volume: 82-12, Section: B.
500 $a Includes supplementary digital materials.
500 $a Advisor: Lezsovits, Ferenc.
502 $a Thesis (Ph.D.)--Budapest University of Technology and Economics (Hungary), 2020.
506 $a This item must not be sold to any third party vendors.
520 $a In many heat exchange systems, boiling heat transfer play a significant role in transferring heat from one medium to another. Boiling heat transfer is an efficient heat transfer mode among others, and this is due to the latent heat of vaporization during the boiling phase change phenomenon. The nucleate boiling regime involved in many industrial applications to remove high heat flux in relatively small superheat temperature, which, in turn, makes these systems more durable and efficient. Adequate cooling fluids are needed to pass high heat flux from a heating surface to the fluid by applying the smallest temperature difference per unit time and area in the solid surface during boiling phase change. Nanofluids are engineered colloids or suspensions, which are produced by dispersing nanoscale solid materials such as metallic, nonmetallic, and carbon into conventional liquids such as water, oil, ethylene, tri-ethylene-glycols, polymeric solutions, and refrigerants to enhance thermal transport properties. In the present research, the pool boiling heat transfer performance of deionized water and different types of nanofluids from a horizontal heated copper typical tube at atmospheric pressure condition was investigated. Firstly, the boiling model under the Eulerian-Eulerian multiphase model was corrected and extended to mimic the pool boiling heat transfer from different heating element geometries. The commercial computational fluid dynamics CFD code using build-in functions and additional user-defined functions UDFs related to nucleate boiling parameters of silica nanofluids was used to investigate pool boiling behavior from flat plate heating element. Afterward, the corrected model by modifying the bubble waiting time coefficient in quenching heat flux partition was used to validate and predict the pool boiling heat transfer of ceria nanofluids from a horizontal heated tube at atmospheric pressure. Next, an experimental setup was designed, fabricated and collected for validation of the numerical results of ceria nanofluids and also to investigate the pool boiling heat transfer performance of other types of nanofluid from a typical horizontal heated copper tube with an outer diameter (22 mm). Before the test of nanofluids for pool boiling performance, the thermal conductivity of deionized water and various nanofluids was measured by the transient plate source sensor at different volume concentrations and temperatures. The two-step method was utilized to prepare our mono and hybrid nanofluids and the stability of the nanofluids was checked to confirm the applicability of using those nanofluids in the current tests. The results demonstrated that the thermal conductivity of prepared nanofluids was enhanced compared to deionized water as a baseline case, and this enhancement was increased with increasing the volume concentrations and temperatures. The obtained results regarding the pool boiling tests showed that using nanofluids as working fluids in the pool boiling heat transfer process might reduce or enhance the pool boiling heat transfer coefficient. The pool boiling heat transfer coefficient enhancement ratio of nanofluids relative to deionized water was improved or deteriorated depends on the nanomaterials type, size, concentrations and the heating surface characteristics. Moreover, a new kind of nanofluids so-called hybrid nanofluids which are produced by adding complex nanopowders (hybrid ones) or by mixing two different nanofluids were prepared to investigate the pool boiling behavior in the current research. Results have shown that the pool boiling heat transfer performance was enhanced for both types of hybrid nanofluids that are used for pool boiling tests when using dilute volume concentrations.
590 $a School code: 2483.
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650 4 $a Nuclear reactors. $3 673875
650 4 $a Cooling. $3 1457878
650 4 $a Viscosity. $3 1050706
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