Experimental investigation of Convective Heat Transfer of Carbon Nanotubes / Water Flow in a helical Triple tube Heat Exchanger

Document Type : Research Paper

Authors

1 Correspondig Author, Assistant Professor, Reactor and Nuclear Safety Research School, Nuclear Science and Technology Research Institute (NSTRI), Iran

2 M.Sc. of Mechanical Engineering, Islamic Azad University, Iran

Abstract

In this work, the thermal performance of CNT/water nanofluid for the heat
exchanger with helical triple tubes is investigated experimentally. The
geometry of the tube, the volume percentage of nanoparticles,
and Reynolds number are three key characteristics investigated. Two
cases with different curvature ratios of 0.010 and 0.0167 are constructed
and compared to investigate the impact of the curvature ratio on
convection heat transfer. The results show that the Nusselt number of
nanofluids is larger than the base fluid. In addition, maximum and
minimum values of Nusselt number are found for Reynolds numbers of
1000 and 5000 correspondingly. The results show a slight reduction in
pressure drop for pure water as the Dean number increased. Moreover,
while the volume fraction of nanoparticles less than 0.1%, the Nusselt
number increased with a shallow slope.

Keywords

Main Subjects


[1] Maghrabie, H.M., Attalla, M., and Mohsen, A.A.A., "Performance Assessment of a Shell
and Helically Coiled Tube Heat Exchanger with Variable Orientations Utilizing Different
Nanofluids", Applied Thermal Engineering, Vol. 182, 116013,
doi:10.1016/j.applthermaleng.2020.116013, (2020).
[2] Amrollahi, A., Hamidi, A.A., and Rashidi, A.M., "The Effects of Temperature, Volume
Fraction and Vibration Time on the Thermo-physical Properties of a Carbon Nanotube
Suspension (Carbon Nanofluid)", Nanotechnology, Vol. 19(31), doi:10.1088/0957-
4484/19/31/315701, (2008).
[3] Mukeshkumara, P.C., Kumarb, J., Sureshc, S., and Praveen babuc, K., "Experimental Study
on Parallel and Counter Flow Configuration of a Shell and Helically Coiled Tube Heat
Exchanger Using Al2O3 / Water Nanofluid", Journal of Materials and Environmental Science,
Vol. 3(4), pp. 766-775, (2012).
[4] Kannadasan, N., Ramanathan, K., and Suresh, S., "Comparison of Heat Transfer and
Pressure Drop in Horizontal and Vertical Helically Coiled Heat Exchanger with CuO/Water
Based Nano Fluids", Experimental Thermal and Fluid Science, Vol. 42, pp. 64-70,
doi:10.1016/j.expthermflusci.2012.03.031, (2012).
[5] Akbaridoust, F., Rakhsha, M., Abbassi, A., and Saffar-Avval, M., "Experimental and
Numerical Investigation of Nanofluid Heat Transfer in Helically Coiled Tubes at Constant
Wall Temperature Using Dispersion Model", International Journal of Heat and Mass Transfer,
Vol. 58, pp. 480-491, doi:10.1016/j.ijheatmasstransfer.2012.11.064, (2013).
[6] Kim, S., Tserengombo, B., Choi, S.H., Noh, J., Huh, S., Choi, B., Chung, H., Kim, J., and
Jeong, H., "Experimental Investigation of Heat Transfer Coefficient with Al2O3 Nanofluid in
Small Diameter Tubes", Applied Thermal Engineering, Vol. 146, pp. 346–355.
doi:10.1016/j.applthermaleng.2018.10.001, (2019).
[7] Palanisamy, K., and Mukesh Kumar, P.C., "Experimental Investigation on Convective Heat
Transfer and Pressure Drop of Cone Helically Coiled Tube Heat Exchanger Using Carbon
Nanotubes/Water Nanofluids", Heliyon. Vol. 5(5), e01705.
doi:10.1016/j.heliyon.2019.e01705, (2019).
[8] Logesh, K., Tiwari, R., Harish, R., Ajay, S., and Sunilrao, N.A., "Experimental Studies on
Convective Heat Transfer Coefficient of Al2O3/Ethylene Glycol-carbon Nano Tube
Nanofluids", Material Today Proceeding, Vol. 18, pp. 4738–4744.
doi:10.1016/j.matpr.2019.07.461, (2019).
[9] Ying, Z., He, B., Su, L., Kuang, Y., He, D., and Lin, C., "Convective Heat Transfer of
Molten Salt-based Nanofluid in a Receiver Tube with Non-uniform Heat Flux", Applied
Thermal Engineering, Vol. 181, doi:10.1016/j.applthermaleng.2020.115922, (2020).
[10] Wang, G., Wang, D., Peng, X., Han, L., Xiang, S., and Ma, F., "Experimental and
Numerical Study on Heat Transfer and Flow Characteristics in the Shell Side of Helically
Coiled Trilobal Tube Heat Exchanger", Applied Thermal Engineering, Vol. 149,
doi:10.1016/j.applthermaleng.2018.11.055, (2019).
[11] Fares, M., AL-Mayyahi, M., and AL-Saad, M., "Heat Transfer Analysis of a Shell and
Tube Heat Exchanger Operated with Graphene Nanofluids", Case Studies in Thermal
Engineering, Vol. 18, 100584. doi:10.1016/j.csite.2020.100584, (2020).
[12] Naghdbishi, A., Yazdi, M.E., and Akbari, G., "Experimental Investigation of the Effect of
Multi-wall Carbon Nanotube – water/Glycol Based Nanofluids on a PVT System Integrated
with PCM-covered Collector", Applied Thermal Engineering, Vol. 178, 115556.
doi:10.1016/j.applthermaleng.2020.115556, (2020).
[13] Garg, P., Alvarado, J.L., Marsh, C., Carlson, T.A., Kessler, D.A., and Annamalai, K., "An
Experimental Study on the Effect of Ultrasonication on Viscosity and Heat Transfer
Performance of Multi-wall Carbon Nanotube-based Aqueous Nanofluids", International
Journal of Heat and Mass Transfer, Vol. 52, pp. 5090-5101,
doi:10.1016/j.ijheatmasstransfer.2009.04.029, (2009).
[14] Abdul Hamid, K., Azmi, W.H., Mamat, R., and Sharma, K.V., "Heat Transfer Performance
of TiO2–SiO2 Nanofluids in a Tube with Wire Coil Inserts", Applied Thermal Engineering,
Vol. 152, doi:10.1016/j.applthermaleng.2019.02.083, (2019).
[15] Ding, Y., Alias, H., Wen, D., and Williams, R.A., "Heat Transfer of Aqueous Suspensions
of Carbon Nanotubes (CNT Nanofluids)", International Journal of Heat and Mass Transfer,
Vol. 49, pp. 240-250, doi:10.1016/j.ijheatmasstransfer.2005.07.009, (2006).
[16] Manlapaz, R.L., and Churchill, S.W., "Fully Developed Laminar Convection from a
Helical Coil", Chemical Engineering Communications, Vol. 9, pp. 185-200,
doi:10.1080/00986448108911023, (1981).
[17] Moffat, R.G., "Describing the Uncertainties in Experimental Results", Experimental
Thermal and Fluid Science, Vol. 1, pp. 3–17, doi:10.1016/0894-1777(88)90043-X, (1988).