Air Injection Impact on Thermal Performance of Vertical Tube with Helical Corrugations: Upward Flow

Document Type : Original Article

Authors

1 Mechanical Engineering Department, University of Tehran, Tehran, Iran

2 Mechanical Engineering Department, Tarbiat Modares University, Tehran, Iran

Abstract

In this experimental work, the 2-phase air-water non-boiling ascending fluid flow in a vertical tube with helical corrugations has been investigated. The results showed that the head loss values decreased with an increase of the volume fraction. Also, by comparing the head loss values for each corrugation pitch, it can be observed that as the corrugation pitch goes down, the head loss values significantly increase. As a result, the intensity of vapors increases perpendicular to the main flow of water, which leads to an increase in the intensity of disturbance in the flow, and then the head loss increases. The Nusselt number goes down when the volume fraction experiences an increment. Looking at the figures related to Nusselt number, it is easy to see that the curves are drawn for a constant air flow rate. Consequently, an increase in volume fraction (VF) is equal to a decrease in the water flow rate. By reducing the water flow rate, the intensity of the main flow is reduced the intensity of turbulence is also reduced and the heat transfer coefficient is reduced. As a result, the amount of heat transfer has increased due to air injection. It should be noted that pipes with the largest corrugation pitch had the best Cost-benefit ratio (C.B.R.) factor values (which means the lowest value). This means that air injection in larger corrugation pitch tubes was more beneficial than in smaller corrugation pitch tubes.

Keywords

Main Subjects

References

  1. Wu, Z., Lei, D., Yuan, G., Shao, J., Zhang, Y., and Wang, Z., 2014. Structural reliability analysis of parabolic trough receivers. Applied Energy, 123, pp.232–241. Doi: 10.1016/j.apenergy.2014.02.068
  2. Akbarzadeh, S., and Valipour, M.S., 2018. Heat transfer enhancement in parabolic trough collectors: A comprehensive review. Renewable and Sustainable Energy Reviews, 92, pp.198–218. Doi: 10.1016/j.rser.2018.04.093
  3. Amani, K., Ebrahimpour, M., Akbarzadeh, S., and Valipour, M.S., 2020. The utilization of conical strip inserts in a parabolic trough collector. Journal of Thermal Analysis and Calorimetry, 140(3), pp.1625–1631. Doi: 10.1007/s10973-019-09233-1
  4. Huang, Z., Li, Z.-Y., Yu, G.-L., and Tao, W.-Q., 2017. Numerical investigations on fully-developed mixed turbulent convection in dimpled parabolic trough receiver tubes. Applied Thermal Engineering, 114, pp.1287–1299. Doi: 10.1016/j.applthermaleng.2016.10.012
  5. Bellos, E., Tzivanidis, C., Antonopoulos, K.A., and Gkinis, G., 2016. Thermal enhancement of solar parabolic trough collectors by using nanofluids and converging-diverging absorber tube. Renewable Energy, 94, pp.213–222. Doi: 10.1016/j.renene.2016.03.062
  6. Sun, M., and Zeng, M., 2018. Investigation on turbulent flow and heat transfer characteristics and technical economy of corrugated tube. Applied Thermal Engineering, 129, pp.1–11. Doi: 10.1016/j.applthermaleng.2017.09.136
  7. Hilo, A.K., Abu Talib, A.R., Acosta Iborra, A., Hameed Sultan, M.T., and Abdul Hamid, M.F., 2020. Effect of corrugated wall combined with backward-facing step channel on fluid flow and heat transfer. Energy, 190, pp.116294. Doi: 10.1016/j.energy.2019.116294
  8. Peng, H., Liu, L., Ling, X., and Li, Y., 2016. Thermo-hydraulic performances of internally finned tube with a new type wave fin arrays. Applied Thermal Engineering, 98, pp.1174–1188. Doi: 10.1016/j.applthermaleng.2015.12.115
  9. Mahdi Heyhat, M., Abdi, A., and Jafarzad, A., 2018. Performance evaluation and exergy analysis of a double pipe heat exchanger under air bubble injection. Applied Thermal Engineering, 143, pp.582–593. Doi: 10.1016/j.applthermaleng.2018.07.129
  10. Khorasani, S., Moosavi, A., Dadvand, A., and Hashemian, M., 2019. A comprehensive second law analysis of coil side air injection in the shell and coiled tube heat exchanger: An experimental study. Applied Thermal Engineering, 150, pp.80–87. Doi: 10.1016/j.applthermaleng.2018.12.163
  11. Kim, D., and Ghajar, A.J., 2002. Heat transfer measurements and correlations for air–water flow of different flow patterns in a horizontal pipe. Experimental Thermal and Fluid Science, 25(8), pp.659–676. Doi: 10.1016/S0894-1777(01)00120-0
  12. Kim, J., and Ghajar, A.J., 2006. A general heat transfer correlation for non-boiling gas–liquid flow with different flow patterns in horizontal pipes. International Journal of Multiphase Flow, 32(4), pp.447–465. Doi: 10.1016/j.ijmultiphaseflow.2006.01.002
  13. López, J., Pineda, H., Bello, D., and Ratkovich, N., 2016. Study of liquid–gas two-phase flow in horizontal pipes using high speed filming and computational fluid dynamics. Experimental Thermal and Fluid Science, 76, pp.126–134. Doi: 10.1016/j.expthermflusci.2016.02.013
  14. Thaker, J., and Banerjee, J., 2016. On intermittent flow characteristics of gas–liquid two-phase flow. Nuclear Engineering and Design, 310, pp.363–377. Doi: 10.1016/j.nucengdes.2016.10.020
  15. Abazari Bahnemiri, H., Oloomi, S.A.A., Mirjalily, S.A.A., and Zare-Shahabadi, A., 2021. The Role of Nanoparticles and Different Tube Diameter on Thermal Performance in Shell and Helically Coiled Tube Heat Exchangers with Single Phase and Sub-cooled Boiling Flow. Iranian (Iranica) Journal of Energy & Environment, 12(4), pp.367–377. Doi: 10.5829/IJEE.2021.12.04.10
  16. Umayal Sundari, A., Neelamegam, P., and Subramanian, C., 2013. Performance of Evacuated Tube Collector Solar Dryer with and Without Heat Sources. Iranian (Iranica) Journal of Energy & Environment, 4(4), pp.336–342. Doi: 10.5829/idosi.ijee.2013.04.04.04
  17. Bagheri, S., Oloomi, S.A.A., Mirjalily, S.A.A., and Zare-Shahabadi, A., 2022. Bubble Dynamics and Nucleate Pool Boiling of Natural Convection. Iranian (Iranica) Journal of Energy & Environment, 13(4), pp.384–397. Doi: 10.5829/IJEE.2022.13.04.08
  18. Liu, X., Liu, L., Yang, Y., Liu, B., and Duan, R., 2023. Evaporation characteristics of sessile droplets on flat hydrophobic surfaces in non-boiling regime. International Communications in Heat and Mass Transfer, 142, pp.106614. Doi: 10.1016/j.icheatmasstransfer.2023.106614
  19. Luo, Z., Liang, K., Chen, X., Li, Z., Wang, X., Zhou, H., and Wang, Y., 2023. Numerical investigation of the effect of vibration on spray cooling heat transfer in the non-boiling region. Case Studies in Thermal Engineering, 51, pp.103518. Doi: 10.1016/j.csite.2023.103518
  20. Sinaga, N., Khorasani, S., Sooppy Nisar, K., and Kaood, A., 2021. Second law efficiency analysis of air injection into inner tube of double tube heat exchanger. Alexandria Engineering Journal, 60(1), pp.1465–1476. Doi: 10.1016/j.aej.2020.10.064
Iranica Journal of Energy & Environment
Volume 15, Issue 2
April 2024
Pages 211-219

Files

Share

How to cite

Statistics