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A. Abdollahi, M. R. Salimpour, N. Etesami, Experimental analysis of pool boiling heat transfer of ferrofluid on surfaces deposited with nanofluid, Modares Mechanical 1
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Experimental analysis of pool boiling heat transfer of ferrofluid on surfaces deposited with nanofluid
Ali Abdollahi
1, Mohammad Reza Salimpour
1*, Nasrin Etesami
21- Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, Iran 2- Department of Chemical Engineering, Isfahan University of Technology, Isfahan, Iran
* P.O.B. 841568311, Isfahan, Iran, [email protected]
A RTICLE I NFORMATION A BSTRACT
Original Research Paper Received 07 November 2015 Accepted 15 December 2015 Available Online 25 January 2016
Boiling heat transfer is one of the most applicable heat transfer processes within the industry. In this paper, the pool boiling heat transfer of Fe3O4 /water nanofluid (ferrofluid) in atmospheric pressure has been analyzed experimentally. The nanofluid in this study has been synthesized in a single step and retains high stability. The replication and accuracy of the testing machine has been studied for deionized water three times, indicating an appropriate concordance with the literature. Considering different volume concentrations of the nanofluid has revealed that boiling heat transfer in high concentrations decreases with an increase of concentration, while it rises with the increase of concentration in low concentrations. Hence, boiling heat transfer coefficient in 0.1% volume concentration nanofluid has been measured to be the optimum value which increases up to 43%. The roughness of boiling surface was varied with the deposition of nanoparticles in various conditions of nanofluid concentration, and heat flux. It is noteworthy that in the present research, the effects of surface roughness change due to nano particles deposition and the impact of passing time on boiling process have been investigated for the first time. Therefore, several experiments have been designed in order to study the change of nanoparticles deposition due to the change of nanofluid concentration and boiling surface heat flux. The results indicate that boiling heat transfer of deposited surfaces at low heat fluxes decreases, while it rises at high heat fluxes.
Keywords:
Pool boiling Ferrofluid Surface roughness Nanoparticles deposition
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Fig. 1 Transmission electron microscopy picture of synthesized Iron Oxide/Water nanofluid
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Fig. 2 X-Ray Diffraction pattern of synthesized Fe3O4 nanoparticles XRD
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H ea t F lu x ( k W /m
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1st dionized water
2nd dionized water
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Fig. 8 Heat flux versus wall superheat for different volume concentrations of the nanofluid
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Fig. 9 Boiling heat transfer coefficient versus heat flux for different volume concentrations of the nanofluid
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0 100 200 300 400 500 600 700 800 900 1000
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H ea t F lu x ( k W /m
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wall Superheat (K)
%
0.01% nanofluid 0.05% nanofluid 0.075% nanofluid 0.1% nanofluid 0.2% nanofluid 0.4% nanofluid
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0 100 200 300 400 500 600 700 800 900 1000
B o il in g h ea t tr an sf er c o ff ic ie n t (k W /m
2.K )
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0.05% nanofluid
0.075% nanofluid
0.1% nanofluid
0.2% nanofluid
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27
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Table 1 Nanofluid sedimentation tests with 0.5% volume concentration and average surface roughness before test
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Fig. 11 Heat flux versus wall superheat for tests 1 and 2 with two different volume concentrations of the nanofluid
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Fig. 12 Heat flux versus wall superheat for tests 1 to 4 with 0.5%
volume concentration of the nanofluid
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0 100 200 300 400 500 600 700 800 900 1000
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H ea t F lu x (k W /m
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Wall Superheat(K) Test 1-0.5% nanofluid Test 2-0.5% nanofluid Test 1-0.1% nanofluid Test 2-0.1% nanofluid
0 100 200 300 400 500 600 700 800 900 1000
2 4 6 8 10 12 14 16 18 20
H ea t F lu x (k W /m
2)
wall Superheat (K) Test 1-0.5% nanofluid Test 2-0.5% nanofluid Test 3-0.5% nanofluid Test 4-0.5% nanofluid
0 100 200 300 400 500 600 700 800 900
2 4 6 8 10 12 14 16 18 20 22 24
H ea t F lu x ( k W /m
2)
Wall Superheat (K)
Test 1-0.5% nanofluid
Test 5-0.5% nanofluid
Test 6-0.5% nanofluid
29
Fig. 14 Heat flux versus wall superheat for tests 7 and 8 with 0.5%
volume concentration of the nanofluid
7 14 8
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- 5 J/kgK)
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l s sat v
- 6
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