Model based study of SWCNT and MWCNT thermal conductivities effect on the heat transfer due to the oscillating wall conditions. (30th November 2017)

• Record Type: Journal Article
• Authors: Nadeem, S.; Khan, A.U.; Hussain, S.T.
• Is Part Of: International journal of hydrogen energy. Volume 42:Number 48(2017)
• Page Start: 28945
• Page End: 28957
• Publication Date: 2017-11-30
• Subjects: CNT's -- Thermal conductivity -- Nanofluids -- Oscillating wall conditions -- Heat transfer; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2017.09.114
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: In this study, different proposed theoretical models for the thermal conductivity of Carbon nanotubes are analyzed. Both SWCNT and MWCNT are discussed in three type of base fluids namely ethylene glycol, engine oil and water. By using the fundamental governing laws and their modifications for the presence of solid concentrations are used to mathematically model the differential equations. The complicated coupled system of differential equations are transformed into non-dimensional form via a suitable similarity transformation. Then numerical results have been obtained by using the midpoint method with Richardson extrapolation enhancement. The numerical results can be computed when the length " L " and diameter " d " of CNT ' s are 3 μ m ≤ L ≤ 70 μ m and 10 n m ≤ d ≤ 40 n m . It can be observed that when length and diameter of CNT ' s are 50 μ m × 25 n m, the calculated value of Yamada and Ota model is greater than that of Xue and HC (Hamilton and Crosser) model. Highlights: Unsteady oscillating stagnations point Inclined impinging fluid. Comparison of different thermal conductivity models for CNTs in phase flows. Experimental thermos-physical properties used to generate results. A big difference is observed between the predicted values of Yamada model and Hamilton & Crosser model. All three models predicts decrease in skin friction with the increase in nanotubes concentration.