THERMAL SCIENCE

International Scientific Journal

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Analysis on thermal and flow behavior of triple concentric tube heat exchanger handling MWCNT/water nanofluids

ABSTRACT
Design of heat exchangers and heat transfer enhancement methods are struggling to meet out the cooling demand of present scenario. Many researchers suggested that the addition of nano sized solids particles into traditional base fluids resulting the higher heat transfer rate than the existing coolants and named the new fluids as nanofluids. In this investigation, the effect of MWCNT/water nanofluids on heat transfer rate, pressure drop and pumping power of a Triple Concentric Tube Heat Exchanger (TCTHE) are experimentally investigated and compared the results of MWCNT/water nanofluids with water. The MWCNT/water nanofluids were prepared by two step method at the volume concentration of 0.2%, 0.4% and 0.6%. The range of target fluid mass flow rate is in the range of 0.026 to 0.039 kg/sec and the constant heat flux condition is considered. On experimentation, it is noted that the effectiveness and pressure drop of 0.6% MWCNT water based nanofluids are 27% and 21% greater than water at the maximum mass flow rate. The reason for improved heat transfer rate of nanofluids is because of higher thermal conductivity, Brownian motion, lower boundary layer thickness and lower specific heat capacity of nanofluids. Also found that the pumping power increases with increasing volume concentration and pumping power is 25 % higher than water at the 0.6% nanofluids. Therefore, the MWCNT/water nanofluids are good choice for replacing water as coolant in TCTHE.
KEYWORDS
PAPER SUBMITTED: 2019-04-13
PAPER REVISED: 2019-05-12
PAPER ACCEPTED: 2019-06-03
PUBLISHED ONLINE: 2019-11-02
DOI REFERENCE: https://doi.org/10.2298/TSCI190413396P
REFERENCES
  1. Zuritz, C.A., On the design of triple concentric-tube heat exchanger, J. Food Process Eng., 21 (1990), 1, pp.113-130.
  2. Garcia-Valladares, O., Numerical simulation of triple concentric-tube heat exchangers, Int. J. Therm. Sci., 43 (2004), 2, pp.979-991.
  3. Ǖnal, A., Effectiveness-NTU relations for triple concentric-tube heat exchanger, Int. Commun. Heat Mass Transf., 30 (2003), 1, pp.261-272.
  4. Sahoo, P.K., et al., Milk fouling simulation in helical triple tube heat exchanger, J. Food Eng., 69 (2005), 5, pp.235-244
  5. Quadir, G.A., et al., Experimental investigation of the performance of a triple concentric pipe heat exchanger, Int. J. Heat Mass Transf., 62 (2013), 4, pp.562-566.
  6. Quadir, G.A., et al., Numerical investigation of the performance of a triple concentric pipe heat exchanger, Int. J. Heat Mass Transf., 75 (2014), 4, pp.165-172.
  7. Godwin Antony.A, et al.,Analysis and optimization of performance parameters in computerized I.C. engine using diesel blended with linseed oil and leishmaan's solution, Mech. Mech. Eng., 21(2017), 2, pp. 193- 205.
  8. Basal B. Ǖnal A. Numerical evaluation of a triple concentric-tube latent heat thermal energy storage, Sol Energy, 92 (2013), 1, pp.196-205.
  9. Gomaa, A., et al., Enhancement of cooling characteristics and optimization of a triple concentrictube heat exchanger with inserted ribs, International Journal of Thermal Sciences, 120 (2017), 3, pp.106-120
  10. Taraprasad Mohapatra, et al., Experimental investigation of convective heat transfer in an inserted coiled tube type three fluid heat exchanger, Applied Thermal Engineering, 117 (2017), 2, pp.297- 307.
  11. Taraprasad Mohapatra, et al., Performance analysis of three fluid heat exchanger used in solar flat plate collector system, Energy Procedia, 109 (2017), 1, pp.322 - 330.
  12. Rădulescu, S., et al., Analysis of the heat transfer in double and triple concentric tube heat exchangers, IOP Conf. Series: Materials Science and Engineering, 147 (2016), pp. 2148.
  13. Pradeep Mohan Kumar.K., et al., Computational Analysis and Optimization of Spiral Plate Heat Exchanger, J. of Applied Fluid Mechanics, Volume 11 (2018), Special Issue, pp.no, 121-128,.
  14. Patrascioiu, C., and Radulescu, S., Prediction of the outlet temperatures in triple concentric-tube heat exchangers in laminar flow regime: case study, J Heat Mass Transf ., 51 (2015), 1, pp.59-66.
  15. Batmaz, E., and Sandeep, K.P., Calculation of overall heat transfer coefficients in a triple tube heat exchanger, Heat Mass Transfer, 41 (2005), 2, pp.271-279.
  16. Avudaiappan.T, et al., Potential Flow Simulation through Lagrangian Interpolation Meshless Method Coding, J. of Applied Fluid Mechanics, 11 (2018), Special Issue, pp. 129 -134,.
  17. Choi SUS., Enhancing thermal conductivity of fluids with nanoparticles, developments and applications of non-newtonian flows. ASME, 231 (1995), 2, pp.99-105,
  18. Choi, S., et al., Anomalous thermal conductivity enhancement in nanotube suspensions, Appl. Phys. Lett. 79 (2001), 14, pp.2252-2254.
  19. Saravankumar.P.T, et al., Ecological effect of corn oil biofuel with Si, Energy Sources, Part A: Recovery, Utilization, and Environmental Effects doi.org/10.1080/15567036.2019.1576079 (2019).
  20. Govindasamy.P, et al., Experimental Investigation of the Effect of Compression Ratio in a Direct Injection Diesel Engine Fueled with Spirulina Algae Biodiesel, J. of Applied Fluid Mechanics,11(2019), Special Issue, pp. 107-114.
  21. Mukesh Kumar, P.C., et al., Experimental study on parallel and counter flow configuration of a shell and helically coiled tube heat exchanger using Al2O3/ water nanofluid, Journal of Material and Environmental Science, 3 (2012), 4, pp.766-775
  22. Mukesh Kumar, P.C., et al., Heat transfer and pressure drop of Al2O3 nanofluid as coolant in shell and helically coiled tube heat exchanger, Bulgarian Chemical Communications, 46 (2014), 4, pp.743 - 749.