The Experts below are selected from a list of 288 Experts worldwide ranked by ideXlab platform

Yingfeng Shao - One of the best experts on this subject based on the ideXlab platform.

  • enhanced thermal shock Resistance of ceramics through biomimetically inspired nanofins
    Physical Review Letters, 2010
    Co-Authors: Fa Song, Songhe Meng, Yingfeng Shao
    Abstract:

    We propose here a new method to make ceramics insensitive to thermal shock up to their melting temperature. In this method the surface of ceramics was biomimetically roughened into nanofinned surface that creates a thin air layer enveloping the surface of the ceramics during quenching. This air layer increases the Heat Transfer Resistance of the surface of the ceramics by about 10 000 times so that the strong thermal gradient and stresses produced by the steep temperature difference in thermal shock did not occur both on the actual surface and in the interior of the ceramics. This method effectively extends the applications of existing ceramics in the extreme thermal environments.

Ming Shan - One of the best experts on this subject based on the ideXlab platform.

  • experimental analysis on thermal performance of a solar air collector with a single pass
    Building and Environment, 2012
    Co-Authors: Ming Yang, Pengsu Wang, Xudong Yang, Ming Shan
    Abstract:

    Abstract Five critical parameters may have influence on the thermal performance of a solar air collector with one pass: (1) Heat Transfer Resistance in the airflow channel, (2) height of the stagnant air layer, (3) optical properties of the transparent cover, (4) emittance of the absorber plate and (5) conductive thermal Resistance of the back plate. In order to show the actual effects of these parameters, six collectors, each was made by changing one critical parameter mentioned above, were tested under the same working conditions. Thermal efficiency was employed as the main indicator. Results show that decreasing Heat Transfer Resistance in the airflow channel played the most significant role in improving thermal efficiency. Adjusting the height of the stagnant air layer and improving the optical properties of the transparent cover played the secondary role. Increasing the conductive thermal Resistance of the back plate and decreasing the emittance of the absorber plate had the least impact. The results would be useful to guide or optimize solar air collector design.

Yiming Cao - One of the best experts on this subject based on the ideXlab platform.

  • Investigation of flux attenuation and crystallization behavior in submerged vacuum membrane distillation (SVMD) for SWRO brine concentration
    Chemical Engineering and Processing - Process Intensification, 2019
    Co-Authors: Tong Zou, Guodong Kang, Meiqing Zhou, Li Meng, Yiming Cao
    Abstract:

    Abstract This work studied the concentration of seawater reverse osmosis (SWRO) brine by a submerged vacuum membrane distillation (SVMD) process. Factors for flux attenuation including CaSO4 crystallization,vapour pressure depression, the increase of Heat Transfer Resistance and membrane fouling were distinguished by the combination of experiment and theoretical calculation. It was suggested that CaSO4 crystallization was the main reason for flux attenuation, which should be eliminated by appropriate feed pretreatment with additional of Na2CO3 and HCl. The combined effect of other three factors was another important reason for flux attenuation. Although the effect of CaSO4 crystallization was eliminated, there still existed a critical VCF after which membrane fouling and increase of Heat Transfer Resistance could not be neglected. The result indicated that this critical VCF was about 2.5 under the experimental condition, which was far less than the VCF at which NaCl solution reached saturation. Therefore, finding an effective method to mitigate membrane fouling was still necessary. It was concluded that decreasing the concentration rate by changing the operation mode could effectively increase the critical VCF to 3.7. Meanwhile, the crystallization behavior of NaCl and the size and quality of crystal products would be affected.

Guiqing Chen - One of the best experts on this subject based on the ideXlab platform.

  • Enhanced thermal shock Resistance of ultra-high temperature ceramic by biomimetic surface modification
    Journal of Materials Chemistry A, 2015
    Co-Authors: Baoxi Zhang, Xinghong Zhang, Yunfeng Qiu, Jiecai Han, Changqing Hong, Zujun Peng, Wenbo Han, Guiqing Chen
    Abstract:

    The manipulation of the Heat flow in a ceramic matrix composite is of great importance in industrial and academic fields. Energy flow, as a typical behavior of Heat motion in ceramic surfaces can be confined within specific sites during thermal shock experiments, which weakens the temperature gradient distribution, and hence suppresses the crack propagation. The Heat flow can be rationally controlled by the introduction of a nanostructured surface with a diverse forced convection coefficient and Heat Transfer Resistance. Taking inspiration from a nanofin surface, yttria-stabilized zirconia (YSZ) nanostructures were fabricated using the sol–gel method. This bio-inspired coating exhibits a high forced convection coefficient (2.884 times) and high Heat Transfer Resistance (30 times) because of the existence of irregular nanowires arrays and a porous nanostructure. The introduction of the nanostructured coating resulted in the rapid depression of the thermal gradient and stress concentration, and the crack propagation was also effectively suppressed. This sol–gel coating method effectively enhanced the thermal shock Resistance of the ceramic materials, and indicates the potential for the application of ceramics in extreme environments.

Ken Haenen - One of the best experts on this subject based on the ideXlab platform.

  • Heat Transfer Resistance as a tool to quantify hybridization efficiency of DNA on a nanocrystalline diamond surface
    Diamond and Related Materials, 2014
    Co-Authors: Peter Cornelis, Thijs Vandenryt, Gideon Wackers, Evelien Kellens, Patricia Losada-pérez, Ronald Thoelen, W. De Ceuninck, Kasper Eersels, Sien Drijkoningen, Ken Haenen
    Abstract:

    Abstract In this article, we report on a label-free real-time method based on Heat Transfer resistivity for thermal monitoring of DNA denaturation and its potential to quantify DNA fragments with a specific sequence of interest. Probe DNA, consisting of a 36-mer fragment was covalently immobilized on a nanocrystalline diamond surface, created by chemical vapor deposition on a silicon substrate. Various concentrations of full matched 29-mer target DNA fragments were hybridized with this probe DNA. We observed that the change in Heat Transfer Resistance upon denaturation depends on the concentration of target DNA used during the hybridization, which allowed us to determine the dose–response curve. Therefore, these results illustrate the potential of this technique to quantify the concentration of a specific DNA fragment and to quantify the hybridization efficiency to its probe.

  • Heat Transfer Resistance at solid liquid interfaces a tool for the detection of single nucleotide polymorphisms in dna
    ACS Nano, 2012
    Co-Authors: Bart Van Grinsven, Natalie Vanden Bon, Hannelore Strauven, Lars Grieten, Mohammed Sharif Murib, Kathia Jimenez L Monroy, Stoffel D Janssens, Ken Haenen, Michael J Schoning, Veronique Vermeeren
    Abstract:

    In this article, we report on the Heat-Transfer Resistance at interfaces as a novel, denaturation-based method to detect single-nucleotide polymorphisms in DNA. We observed that a molecular brush of double-stranded DNA grafted onto synthetic diamond surfaces does not notably affect the Heat-Transfer Resistance at the solid-to-liquid interface. In contrast to this, molecular brushes of single-stranded DNA cause, surprisingly, a substantially higher Heat-Transfer Resistance and behave like a thermally insulating layer. This effect can be utilized to identify ds-DNA melting temperatures via the switching from low- to high Heat-Transfer Resistance. The melting temperatures identified with this method for different DNA duplexes (29 base pairs without and with built-in mutations) correlate nicely with data calculated by modeling. The method is fast, label-free (without the need for fluorescent or radioactive markers), allows for repetitive measurements, and can also be extended toward array formats. Reference m...