Performance evaluation on an air-cooled heat exchanger for alumina nanofluid under laminar flow

Teng, Tun Ping; Hung, Yi Hsuan; Chen, Jyun Hong

doi:10.1186/1556-276x-6-488

Cited by 24 publications

(15 citation statements)

References 33 publications

(25 reference statements)

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“…Based on the concepts of mixing theory for ideal gas mixtures and classical and statistical mechanisms, the density of the nanofluid ( nf ) is respectively given by Equations (3) and (4), which are related to volume fraction ( ), bulk fluid density ( bf ), and nanoparticle density ( p ) [13,15,28,29]:…”

Section: Related Theories and Calculationsmentioning

confidence: 99%

“…The nanofluid in these studies consists mainly of CuO/water [1,2], CuO/ethylene glycol [3], Al 2 O 3 /ethylene glycol [3,4], Al 2 O 3 /water [4][5][6][7][8][9], Al 2 O 3 /ethylene glycol/water [10], TiO 2 /water [8,11], and Ag/methanol nanofluid [12]. Moreover, heat exchangers used in these studies include the microchannel heat sink (MCHS) [1,7,10], miniature-plate heat exchanger [2], plate heat exchangers [3], double-tube flow heat exchanger [3,11], multichannel heat exchanger [5], shell and tube heat exchanger [8], finned tube heat exchanger [9,13], and the thermosyphon heat exchanger [12]. Results of these studies demonstrate that nanofluid could improve the performance of heat exchangers.…”

Section: Introductionmentioning

confidence: 99%

“…Generally, calculations of heat-exchange capacity use the temperature difference between inlet and outlet of the heat exchanger multiplied by the mass flow rate and specific heat of the working fluid [5,9,13]. The fluid-flow meter measures volumetric flow rates.…”

Section: Introductionmentioning

confidence: 99%

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Estimation and experimental study of the density and specific heat for alumina nanofluid

Teng

Hung

2012

Journal of Experimental Nanoscience

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111

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This study analyses the density and specific heat of alumina (Al 2 O 3 )/water nanofluid to determine the feasibility of relative calculations. The Al 2 O 3 /water nanofluid was produced by the directsynthesis method with cationic chitosan dispersant served as the experimental sample, and was dispersed into three concentrations of 0.5, 1.0 and 1.5 wt.%. This experiment measures the density and specific heat of nanofluid with weight fractions and sample temperatures with a liquid density meter and a differential scanning calorimeter (DSC). To assess the availability of these equations, it then compares the experimental data with the calculated results according to the concepts of mixing theory and statistical mechanism. Comparing the calculated results of density and specific heat with the experimental data, the deviation of density fell within the range of À1.50% to 0.06% and 0.25% to 2.53%, whereas the deviation of specific heat fell within the range of À0.07% to 5.88% and À0.35% to 4.94%, respectively. Calculated results of density and specific heat show a trend of greater deviation with an increased concentration of nanofluid. However, two kinds of density and specific heat of the calculated results fall within an acceptable deviation range in this study.

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Section: Related Theories and Calculationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Estimation and experimental study of the density and specific heat for alumina nanofluid

Teng

Hung

2012

Journal of Experimental Nanoscience

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111

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“…According to XRD pattern of homopolymer, there is no any sharp peaks related to crystalline zones, therefore, the homopolymer has an amorphous structure. XRD spectrum of the nano composite samples shows the sharp characteristic peaks of the alumina particles, which situated at 2θ = 10°, 35°, 46° and 67° angles which confirm the embedment of the alumina particles into the matrix of the hybrid nanocomposite [20].…”

Section: Dmta Analysismentioning

confidence: 63%

An organic-inorganic polymeric alumina hybrid nanocomposite

Rabiee

Baharvand

2015

Polym. Sci. Ser. B

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An organic inorganic hybrid nanocomposite of poly(2 acrylamido 2 methyl 1 propane sul fonic acid sodium salt) and Al 2 O 3 with nano alumina particles was synthesized in two steps. Firstly, the sur face of nano alumina particles was modified by 3 methacryloxy propyl trimethoxysilane as a coupling agent by sol gel method. Secondly, the surface modified nano alumina particles were grafted onto the poly(2 acry lamido 2 methyl propane sulfonic acid sodium salt) by free radical polymerization. The spectral (FTIR spectroscopy) and thermal (TGA) methods, verified the participation of coupling agent, polymer and alumi num oxide (alumina) into the hybrid structure. Introduction of silanol groups into the alumina particles leads to a better distribution of particles into the polymeric matrix. The results also showed four steps of weight loss for the hybrid nanocomposite, which includes about 80% weight loss until 700°C and 20% of char yield, which is due to presence of alumina, silica and sodium oxide in hybrid nanocomposite. SEM and TEM stud ies confirmed that the nano alumina particles have been spherical and homogeneously dispersed throughout the sample with dimensions in the range of nanosizes inside the nanocomposite sample containing 5 wt % of Al 2 O 3 . The analysis of thermo mechanical properties of homopolymer and its nanocomposite revealed the shift in storage modulus and tanδ peaks that was attributed to morphological changes in the nanocomposites due to the amount of inorganic nano particles and their distribution in polymer matrix. The adsorption behavior showed that hybrid nanocomposites have ability for interaction with heavy metal ions by means of adsorption through interaction between the oppositely charged functionalities and metal ions. However, it was found that the adsorption efficiency of the hybrid nanocomposite is much better than that of its pure polymer.

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“…Studies show that nanofluids enhance heat conduction performance due to their higher thermal conductivity than base fluids [16][17][18][19]. The higher nanoparticle concentration and temperature will increase the random collision behavior which helps increase the thermal conductivity of nanofluid [20,21]. However, some researchers believe that these factors do not cause a significant increase in thermal conductivity [22,23].…”

Section: Introductionmentioning

confidence: 99%

Feasibility Assessment of Thermal Management System for Green Power Sources Using Nanofluid

Hung

Chen

Teng

2013

Journal of Nanomaterials

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A thermal management system using alumina (Al2O3)/water as the nanofluid for green power sources was experimentally assessed in this paper. Basic thermal principles and formulas were utilized to evaluate the performance of an air-cooled heat exchanger. The Al2O3/water nanofluid was produced at the concentrations of 0.5, 1.0, and 1.5 wt.%. The testing conditions of this experiments were above three concentrations, five coolant flow rates (0.8, 1.2, 1.6, 2.0, and 2.4 L/min.), and three heating powers (50, 100, and 150 W). Firstly, basic properties of nanoparticles were analyzed. Fundamental relationships of the Al2O3/water nanofluid with respect to temperatures and concentrations were measured such as: viscosity, density, and specific heat. Next, an innovative concept named efficiency factor (EF) was proposed to quantitatively evaluate the thermal system performance. The enhancement of thermal system performance compared with distilled water was then defined as an efficiency factor ratio (REF). The experimental results demonstrated that the efficiency factor ratios were optimal at low flow rate (0.8 L/min.) and low concentration (0.5%). Values ofREFwere all below 1.0 at high flow rates (1.2–2.4 L/min.). This research points out the direction of optimizing a thermal management system for green energy sources in the near future.

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Performance evaluation on an air-cooled heat exchanger for alumina nanofluid under laminar flow

Cited by 24 publications

References 33 publications

Estimation and experimental study of the density and specific heat for alumina nanofluid

Estimation and experimental study of the density and specific heat for alumina nanofluid

An organic-inorganic polymeric alumina hybrid nanocomposite

Feasibility Assessment of Thermal Management System for Green Power Sources Using Nanofluid

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