Download or read book Experimental Investigation Into Condensation on Heterogeneous Surface written by Ramana Saketh Vanga and published by . This book was released on 2014 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: Renewable energy systems operated by a thermal energy resource such as geothermal power plants and solar thermal power systems are demanding improvement in their condensation performance. While their energy resources are naturally obtained at almost no cost, heat rejecting components are relatively expensive to maintain and operate. In this research, a heterogeneous condensing surface is proposed to enhance the condensation heat transfer coefficient in vapor-to-liquid heat exchangers. Parallel stripes with hydrophobic feature and ones without it alternate on its surface. The effect of surface wettability variation that is generated by the heterogeneous surface on the dropwise condensation heat transfer of saturated steam on the flat plate copper surface is experimentally investigated. A vertical flat plate condenser is constructed to evaluate the performance of the heterogeneous condensing surface in comparison with a plain copper sample and a homogeneous hydrophobic-treated copper sample. Experimental results show that condensation heat transfer of steam on the homogeneous hydrophobic-treated sample is superior to that of the plain copper surface despite the fact that both the surfaces stably promote dropwise condensation. At the subcooling temperature of 3°C, the difference in the heat transfer coefficients between the plain copper sample and the hydrophobic-treated copper sample is almost twofold. The heat transfer coefficients for the heterogeneous surface at smaller subcooling temperatures, when its stripes situate horizontally, are as high as the heat transfer coefficients for the homogeneous hydrophobic-treated surface. The enhancement for the horizontal heterogeneous sample over the plain copper sample is approximately 100%. The heat transfer coefficient for the heterogeneous sample with its stripes being vertical at 4°C subcooling is 25% greater than that of the plain copper sample. Higher heat transfer coefficients are observed at smaller subcooling temperatures for all the samples. The results and observations of this project suggest that the heterogeneous surface has the potential to enhance the heat transfer coefficients.
Download or read book Analytical and Experimental Investigation of Simultaneous Melting vaporization condensation on a Vertical Surface written by Vibhas Chandrachood and published by . This book was released on 1987 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Investigation of the Spirit Manifestations Demonstrating the Existence of Spirits and Their Communion with Mortals written by Robert Hare and published by . This book was released on 1856 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Investigation of Condensation on Mechanically Treated and Superhydrophobic coated Surfaces written by Nataliia Fedorova and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Libri in officina Roberti Stephani typographi Regii partim nati partim restituti et excusi written by and published by . This book was released on 1546 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Theoretical and Experimental Investigation of Condensation Heat Transfer Enhancement on an Inclined Surface Coated with a Highly Conductive Porous Substrate written by Merid Aboye and published by . This book was released on 1992 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the 9th International Conference on Civil Engineering written by Guangliang Feng and published by Springer Nature. This book was released on 2023-06-17 with total page 627 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book is a compilation of selected papers from the 9th International Conference on Civil Engineering (ICCE2022). The work focuses on novel research findings on seismic technology of civil engineering structures, High-tech construction materials, digitalization of civil engineering, urban underground space development. The contents make valuable contributions to academic researchers and engineers.
Download or read book Experimental Investigation of Condensation Heat Transfer on Corrugated Surfaces written by George Stuart Harrison and published by . This book was released on 1970 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Experimental Investigation of Cylinder Condensation written by William Wilberforce Churchill and published by . This book was released on 1890 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Heat transfer in data centers volume II written by Chengbin Zhang and published by Frontiers Media SA. This book was released on 2023-03-24 with total page 89 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Investigation of Condensation in the Presence of Noncondensable Gases in Crossflow on a Vertical Flat Plate written by David Ethan Steiger and published by . This book was released on 1995 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Processes of Formation of Micro and Nanodispersed Systems written by A. A. Bochkarev and published by CRC Press. This book was released on 2015-11-05 with total page 473 pages. Available in PDF, EPUB and Kindle. Book excerpt: Processes of Formation of Micro- and Nanodispersed Systems is a comprehensive analysis and presentation of the physical processes and phenomena that lead to the formation of disperse materials. It also details the properties of disperse materials yielded from various processes.Special attention is given to the homogeneous condensation of metal vapo
Download or read book Theoretical and Experimental Investigation of Condensation on Amphiphilic Nanostructured Surfaces written by David Milton Anderson and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Condensation of water vapor is an everyday phenomenon which plays an important role in power generation schemes, desalination applications and high-heat flux cooling of power electronic devices. Continuous dropwise condensation is a desirable mode of condensation in which small, highly-spherical droplets regularly form and shed off the surface before a thick liquid is formed, thereby minimizing the thermal resistance to heat transfer across the condensate layer. While difficult to induce and sustain, dropwise condensation has been shown to achieve heat and mass transfer coefficients over an order of magnitude higher than its filmwise counterpart. Superhydrophobic surfaces have been extensively studied to promote dropwise condensation with mixed results; often surfaces that are superhydrophobic to deposited droplets formed in the gas phase above the surface do not retain this behavior with condensed droplets nucleated and grown on the surface. Recently, nanostructured superhydrophobic surfaces have been developed that are robust to vapor condensation; however, these surfaces still are not ideal for condensation heat transfer due to the high thermal resistance of the vapor layer trapped underneath the droplets and the reduced footprint of direct contact between the highly-spherical droplets and the underlying substrate. This work has two main objectives. First, a comprehensive free energy based thermodynamic model is developed to better understand why traditional superhydrophobic surfaces often lose their properties when exposed to condensed droplets. The model is first validated using data from the existing literature and then extended to analyze the suitability of amphiphilic (e.g. part hydrophobic and part hydrophilic) nanostructured surfaces for condensation applications. Secondly, one of the promising amphiphilic surfaces identified by the thermodynamic model is fabricated and tested to observe condensation dynamic behavior. Two complementary visualization techniques, environmental scanning electron microscopy (ESEM) and optical (light) microscopy, are used to probe the condensation behavior and compare the performance to that of a traditional superhydrophobic surface. Observations from the condensation experiments are used to propose a new mechanism of coalescence that governs the temporal droplet size distribution on the amphiphilic nanostructured surface and continually generates fresh sites for the droplet nucleation and growth cycle that is most efficient at heat transfer.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Scientific and Technical Reports written by United States. National Aeronautics and Space Administration Scientific and Technical Information Division and published by . This book was released on 1968 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Earth Resources written by and published by . This book was released on 1983 with total page 758 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the First International Symposium on Water Desalination written by and published by . This book was released on 1966 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt:
