Journal of Engineering Sciences

Author(s): Nogueira E.

Affiliation(s): Department of Mechanics and Energy, State University of Rio de Janeiro, Brazil.

^*Corresponding Author’s Address: [email protected]

Issue: Volume 7, Issue 2 (2020)

Dates:
Paper received: April 28, 2020
The final version of the paper received: August 14, 2020
Paper accepted online: August 28, 2020

Citation:
Nogueira, E. (2020). Thermal performance in heat exchangers by the irreversibility, effectiveness, and efficiency concepts using nanofluids. Journal of Engineering Sciences, Vol. 7(2), pp. F1–F7, doi: 10.21272/jes.2020.7(2).f1

DOI: 10.21272/jes.2020.7(2).f1

Research Area:  CHEMICAL ENGINEERING: Processes in Machines and Devices

Abstract. The objective of the work is to obtain the outlet temperatures of the fluids in a shell and tube heat exchanger. The second law of thermodynamics is applied through the concepts of efficiency, effectiveness, and irreversibility to analyze the results. Water flows in the shell, and a mixture of water-ethylene glycol is associated with fractions of nanoparticles flows in the tube. Water enters the shell at 27 °C, and the mixture comes to the tube at 90 °C. The mass flow is kept fixed in the shell, equal to 0.23 kg/s, and varies between 0.01 kg/s to 0.50 kg/s. Volume fractions equal to 0.01, 0.10, and 0.25 were considered for analysis, for both nanoparticles from Ag and Al₂O₃. Results for Reynolds number, heat transfer rate, efficiency, effectiveness, and irreversibility are presented for critique, discussion, and justification of the output data found. It is shown that the flow regime has a significant effect on the performance of the analyzed heat exchanger.

Keywords: thermodynamics, second law, ethylene glycol, volume fraction.

References:

1. Fakheri, A. (2007). Heat exchanger efficiency. Transactions of the ASME, Vol. 129, pp. 1268–1276.
2. Bejan, A. (1987). The thermodynamic design of heat and mass transfer processes and devices. Heat and Fluid Flow, Vol. 8(4), pp. 258–276.
3. Molana, M. (2016). A comprehensive review on the nanofluids application in the tubular heat exchangers. American Journal of Heat and Mass Transfer, Vol. 3(5), pp. 352–381.
4. Thakur, G., Singh, G. (2017). An experimental investigation of heat transfer characteristics of water-based Al₂O₃ nanofluid operated shell and tube heat exchanger with air bubble injection technique. International Journal of Engineering and Technology, Vol. 6(4), pp. 83–90.
5. Wang, Z., Han, F., Ji, Y., Li, W. (2020). Performance and exergy transfer analysis of heat exchangers with graphene nanofluids in seawater source marine heat pump system. Energies, Vol. 13, 1762, doi: 10.3390/en13071762.
6. Leong, K. Y., Saidur, R., Khairulmaini, M., Michael, Z., Kamyar, A. (2012). Heat transfer and entropy analysis of three different types of heat exchangers operated with nanofluids. International Communications in Heat and Mass Transfer, Vol. 39, pp. 838–843.
7. Bharadwaj, M. P. S., Babu, S. S. (2017). Heat transfer enhancement in 2S-2T shell and tube heat exchanger with wire coil and twisted tape turbulators using TiO₂ nanofluid. International Journal of Mechanical Engineering and Technology, Vol. 8(7), pp. 846–859.
8. Igwe, J. E., Agu, C. S. (2016). Comparative analysis of different fluids in one shell pass and two tube heat exchanger. American Journal of Engineering Research, Vol. 5(8), pp-81–87.
9. Almurtaji, S., Ali, N., Teixeira, J. A., Addali, A. (2020). On the Role of nanofluids in thermal-hydraulic performance of heat exchangers – a review. Nanomaterials, Vol. 10, 734, doi: 10.3390/nano10040734.
10. Sun, Y., Wang, X., Long, R., Yuan, F., Yang, K. (2019). Numerical investigation and optimization on shell side performance of a shell and tube heat exchanger with inclined trefoil-hole baffles. Energies, Vol. 12, 4138, doi: 10.3390/en12214138.
11. Krishnan, S. S., Archana, S. P., Dayanidhi, R. S., Jayashruthi, R. (2019). Experimental and Investigation of shell and tube heat exchanger. International Journal of Engineering and Techniques, Vol. 5(4), pp. 1–5.
12. Mostafa, A. A. H., Khalil, E. E., El-Hariry, G., Abdelmaksoud, W. A., Saad, E. M. (2017). Shell and tube heat exchanger performance. AIAA Propulsion and Energy Forum of the 15th International Energy Conversion Engineering Conference, pp. 1–13.
13. Albadr, J., Tayal, S., Alasadi, M. (2013). Heat transfer through heat exchanger using Al₂O₃ nanofluid at different concentrations. Case Studies in Thermal Engineering, Vol. 1, pp. 38–44.
14. Nogueira, E. (2020). Thermal-hydraulic performance of graphene nanoribbon and silicon carbide nanoparticles in the multi-louvered radiator for cooling diesel engine. Journal of Engineering Sciences, Vol. 7(1), pp. F22–F29, doi: 10.21272/jes.2020.7(1).f2.

Full Text