نتایج جستجو برای: heat storage and conductivity

تعداد نتایج: 16903624  

Journal: :international journal of nano dimension 0
m. falahaty naghibi school of mechanical enginnering, shahid rajaee teacher training university, tehran, iran. m. rahimi-esbo young researchers and elite club, buin zahra branch, islamic azad university, buin zahra, iran. r. mohammadyari young researchers and elite club, buin zahra branch, islamic azad university, buin zahra, iran. k. mobini school of mechanical enginnering, shahid rajaee teacher training university, tehran, iran.

using of nanofluids and ducts with corrugated walls are both supposed to enhance heat transfer, by increasing the heat transfer fluid conductivity and the heat transfer area respectively. use of a diverging duct with a jet at inlet section may further increase heat transfer by creating recirculation zones inside the duct. in this work two-dimensional incompressible laminar flow of a nanofluid e...

Journal: :The Review of scientific instruments 2013
Jun Liu Jie Zhu Miao Tian Xiaokun Gu Aaron Schmidt Ronggui Yang

The increasing interest in the extraordinary thermal properties of nanostructures has led to the development of various measurement techniques. Transient thermoreflectance method has emerged as a reliable measurement technique for thermal conductivity of thin films. In this method, the determination of thermal conductivity usually relies much on the accuracy of heat capacity input. For new nano...

2001
Ning Zheng

Two figures of merit for hybrid Thermal Energy Storage (TES) units are developed: the volumetric figure of merit, V~ , and the temperature control figure of merit, T~ ∆ . A dimensional analysis shows that these quantities are related to the performance specification of the storage unit and its physical design. A previously benchmarked semi-empirical finite volume model is used to study the char...

The term Nanofluids was first coined by Sir Stephen Choi in 1995 at Argonne National Laboratory ,U.S.A .Since the discovery, nanofluid have been explored as heat transfer fluids. Nanofluids increased the thermal conductivity of existing coolants (Water, Ethylene glycol) by a magnitude of hundred times which made them attractive for miniaturization of electronic devices .From 1995 till 2008 nano...

2017
Zahra Pournorouz Amirhossein Mostafavi Aditya Pinto Apparao Bokka Junha Jeon Donghyun Shin

For the last few years, molten salt nanomaterials have attracted many scientists for their enhanced specific heat by doping a minute concentration of nanoparticles (up to 1% by weight). Likewise, enhancing the specific heat of liquid media is important in many aspects of engineering such as engine oil, coolant, and lubricant. However, such enhancement in specific heat was only observed for molt...

Mahdi Sahebi Mohammad-Reza Ebrahimnataj

Constructal design is used to study heat removal from a square heated body with a tree shaped high thermal conductivity pathways embedded in the body. The objective is to minimize the defined maximum dimensionless temperature difference for the body. The thermal conductivity of the body is low, and there is a uniform heat generation on it. The volume of the body is fixed. The amount of high con...

2005
G. Krainz F. Hofmeister E. Neubacher A. Zieger

Liquid hydrogen (LH2) takes up less storage volume than gas but requires cryogenic vessels. State-of-the-art applications for passenger vehicles consist of double-wall cylindrical tanks that hold a hydrogen storage mass of up to 10 kg. The preferred shell material of the tanks is stainless steel, since it is very resistant against hydrogen brittleness and shows negligible hydrogen permeation. T...

A nanofluid is a dilute liquid suspension of particles with at least one critical dimension smaller than ~100 nm. Research works so far suggest that nanofluids offer excellent heat transfer enhancement over conventional base fluids. The enhancement depends on several factors such as particle shape, particle size distribution, volume fraction of nanoparticles, temperature, pH, and thermal conduc...

2015
Maha Bhouri Inga Bürger Marc Linder

A two‐dimensional model investigating the hydrogen charging process in a combination reactor filled with both LaNi4.3Al0.4Mn0.3 and 2LiNH2‐1.1MgH2‐0.1LiBH4‐3wt.%ZrCoH3 materials has been developed. The selected configuration is a cylindrical reactor of 32 cm of diameter where the MeH is filled in annular tubes separated from the complex hydride bed by a gas permeable layer. The diffusion of hy...

2017
Mfrekemfon Samuel Obot Changcheng Li Ting Fang Jinquan Chen

Thermal properties are necessary for the design and control of processes and storage facilities of food materials. This study proposes the measurement of thermal properties using easily constructed probes with specific heat capacity calculated, as opposed to the use of Differential Scanning Calorimeter (DSC) or other. These probes were constructed and used to measure thermal properties of white...

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