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Experimental Investigation on Heat Transfer and Friction Factor Characteristics of MWCNT-Al2O3/DI Water Nanofluids in a Circular Tube with Inserts

	International Journal of Scientific Research and Engineering Development (IJSRED)	Full Text:
	Published Issue : Volume-4 Issue-1
	Year of Publication : 2021
	Unique Identification Number : IJSRED-V4I1P112
	Authors : K.Gurunath, S.Anbu, K.Velmurugan, P.Arunkumar
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Abstract :

In this experimental investigation, convective heat transfer and friction factor characteristics of MWCNT-Al2O3/ DI water nanofluids flowing through a circular tube with and without spiraled rod inserts is carried out. The experiment is conducted under laminar flow. MWCNT-Al2O3 nanoparticles are used to prepare the nanofluids. The nanoparticles dispersed in DI water to form stable suspension of MWCNT-Al2O3/ DI water nanofluids with 0.1% volume concentration of nanoparticles. It is found that inclusion of nanoparticles to DI water augment Nusselt number. The Nusselt number are measured and found to increase by 29.9% at Re 2240 for plain tube with nanofluids of 0.1% volume concentration compared to DI water. Two spiraled rod inserts are used to enhance the Nusselt Number further which is made up of copper with two different pitches. The insert having lower pitch with nanofluids of 0.1% volume concentration gives maximum enhancement in Nusselt number which is 49.2% at Reynolds number 2240 compared to DI water.