Investigations on heat transfer characteristic of molten salt flow in helical annular duct

Xiao, Peng; Guo, Liejin; Zhang, Ximin

doi:10.1016/j.applthermaleng.2014.09.021

Cited by 36 publications

(6 citation statements)

References 26 publications

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“…Conventionally, molten salts are primarily used as HTFs in medium- to high-temperature applications. The thermal performance of molten salt-based steam generator technology has been already reported . − Water was also used in industrial applications such as HTFs. , However, a narrow liquid range (0–100 °C) and a high vapor pressure of water limit its usability.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Assessment on the Use of Boron Nitride-Based Nanofluids Comprising Eutectic Mixtures of Diphenyl Ether and Menthol for Enhanced Thermal Media

Dehury

Mahanta

Banerjee

2020

ACS Sustainable Chem. Eng.

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The current work explores deep eutectic solvents (DESs) as heat transfer fluids (HTFs) primarily for generating concentrated solar power. The eutectic composition of the DES comprising diphenyl ether and DL-menthol as the hydrogen bond acceptor and hydrogen bond donor was initially computed through the quantum chemical-based COSMO-SAC model. To improve upon the thermal performance and reduce the interfacial resistance, DESs were modified by dispersing hexagonal boron nitride nanoparticles with weight percent ranging from 0.02 to 0.10. Thermophysical properties, namely, density, viscosity, thermal conductivity, and heat capacity, of the HTFs were then measured as a function of temperature. Further, based on these four parameters, the Mouromtseff number (Mo) was calculated to rank the nanoparticle-dispersed DESs. The nanofluid consisting of DES-1 with 0.02 wt % of nanoparticles gave the highest Mo value, and hence, it was further considered for the experimental forced convection study and process simulation using an Aspen Plus simulator. From the forced convection experiment temperature profiles, the heat transfer coefficient and Nusselt number (Nu) were evaluated and compared for nanofluids with the corresponding base fluid. The flow behavior of the thermal fluid along the characteristic length of the test section was investigated for both the laminar and turbulent regimes. The effectiveness of the HTF in terms of steam generation capacity was predicted, and it was observed that the nanofluid with 0.02 wt % was able to successfully convert 100% of the input water (15 kg/h) into superheated steam at the temperature of 494.15 K.

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Section: Introductionmentioning

confidence: 99%

Comprehensive Assessment on the Use of Boron Nitride-Based Nanofluids Comprising Eutectic Mixtures of Diphenyl Ether and Menthol for Enhanced Thermal Media

Dehury

Mahanta

Banerjee

2020

ACS Sustainable Chem. Eng.

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“…For CSP systems, molten salt is a kind of suitable working fluid for its high heat capacity [1] Some studies had been conducted on the characteristics of flow and heat transfer of molten salt. Xiao et al [2] found the frictional pressure drop of molten salt HITEC (53% KNO 3 /40% NaNO 2 /7% NaNO 3 , mass concentration) agreed well with the theoretical prediction within 15% in laminar and turbulent flow regions. Wu et al [3] prepared a new molten salt and found a good agreement between their experimental data and the predictions of Sieder-Tate correlation [4] However, Kunugi et al [5] revealed that poor heat transfer performance of molten salt results in laminarization phenomena and non-uniform heating.…”

Section: Introductionmentioning

confidence: 59%

Numerical investigation of molten salt-based nanofluid laminar heat transfer in a circular tube using Eulerian-Lagrangian method

Ying

2021

THERM SCI

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Molten salt-based nanofluid in a laminar region of a circular tube with constant wall heat flux was numerically investigated. An Eulerian- Lagrangian method, discrete phase model, was used to predict the heat transfer performance of nanofluid, considering the factors of inlet Reynolds number, the mass concentration of the nanoparticles and nanoparticle diameter. Validation results were found in a good match with experimental results obtained from the literature. Numerical results showed that the heat transfer performance of nanofluid was considerably better than that of pure molten salt. The local heat transfer coefficient and Nusselt number of nanofluid are about 30% higher than these of pure molten salt and increase with an increase of Reynolds number and nanoparticle concentration. Moreover, the heat transfer performance of nanofluid with the small size of the nanoparticles (10~100 nm) is improved significantly.

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“…Extensive research has been carried out on fluid flow properties and heat transfer characteristics of HITEC molten salt flow. Xiao et al, investigated on heat transfer and flow parameters using HITEC (53% KNO3 -40% NaNO2 -7% NaNO3, mol.%) in the helical heat exchanger, where HITEC is used as the hot side HTF and DI water at the cold side [75].…”

Section: Molten Salts As Heat Transfer Fluidmentioning

confidence: 99%

State-of-the-art heat transfer fluids for parabolic trough collector

Krishna

Faizal

Saidur

et al. 2020

International Journal of Heat and Mass Transfer

148

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Solar thermal energy conversion is gaining more attention among researchers due to the recent development in nanofluids and molten salt technology. Among various solar collectors, parabolic trough collector has received significant attention from researchers due to their operating temperature range (60-240 °C) feasible for power generation. Parabolic trough collector is currently having a higher number of installations compared to other concentrated solar power technology around the globe. Most of the conventional heat transfer fluid used in PTC has poor heat transfer and light to heat conversion properties. Therefore, it is advantageous to enhance the thermophysical properties of heat transfer fluid to improve the overall efficiency of the system. Well-engineered nano-enhanced heat transfer fluid is advantageous because a very low mass fraction of nanoparticles bring considerable enhancement in thermophysical properties. This paper focuses on the most recent advancement in heat transfer fluids, their preparation, and stability issues when doped with nanoparticles. Various heat transfer fluids currently used in parabolic trough collectors and the nano-enhanced heat transfer fluids having the properties better than conventional heat transfer fluids are compared and their preparation methods and properties are discussed.Enhancement of thermophysical properties of molten salts by doping nanoparticles and their enhancement in thermal stability at high temperature, the possibility of using mono and hybrid nanofluid, ionic liquids, gaseous heat transfer fluid, and vegetable oil as the heat transfer fluid in parabolic trough collectors are the key highlights of this review.

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Investigations on heat transfer characteristic of molten salt flow in helical annular duct

Cited by 36 publications

References 26 publications

Comprehensive Assessment on the Use of Boron Nitride-Based Nanofluids Comprising Eutectic Mixtures of Diphenyl Ether and Menthol for Enhanced Thermal Media

Comprehensive Assessment on the Use of Boron Nitride-Based Nanofluids Comprising Eutectic Mixtures of Diphenyl Ether and Menthol for Enhanced Thermal Media

Numerical investigation of molten salt-based nanofluid laminar heat transfer in a circular tube using Eulerian-Lagrangian method

State-of-the-art heat transfer fluids for parabolic trough collector

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