Author
Prasanna Jayaramu
Bio: Prasanna Jayaramu is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Heat transfer coefficient & Heat transfer. The author has an hindex of 4, co-authored 7 publications receiving 45 citations.
Papers
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TL;DR: In this article, the effect of surface characteristics on flow boiling heat transfer and pressure drop in a microchannel using degasified and deionized water as the working fluid was investigated.
30 citations
TL;DR: In this paper, the influence of copper ageing on flow boiling heat transfer and pressure drop in copper microchannels of two different hydraulic diameters was investigated, and the experimental results showed that the influence was negligible.
Abstract: The study reports the experimental investigation on the influence of copper ageing on flow boiling heat transfer and pressure drop in copper microchannels of two different hydraulic diamete...
13 citations
TL;DR: In this paper, a one-dimensional model is proposed to estimate the pressure drop and heat transfer coefficient for flow boiling in a rectangular microchannel, taking into account the pressure fluctuations caused due to the confined bubble growth and the effect of pressure fluctuations on the heat transfer characteristics.
12 citations
TL;DR: In this paper, experimental pressure drop and heat transfer data for subcooled flow boiling of water in a 1.0mm wide 1.49mm deep 1.40mm long aged copper microchannel were presented.
9 citations
TL;DR: In this paper, the influence of ageing on the surface characteristics of a 1 mm hydraulic diameter end-milled copper channel was investigated. And the authors compared the fresh sample and the aged sample for the surface oxidation, surface chemical composition and surface morphology.
Abstract: Heat sinks and heat exchangers based on flow boiling in mini/microchannels are expected to be more compact and efficient. One of the major challenges while using copper material for phase-change heat transfer application is the change in surface characteristics after prolonged usage due to the thermal oxidation of surface over time. This study involves the repeated experimental runs of flow boiling of water in a 1 mm hydraulic diameter end-milled copper channel to verify the influence of ageing on the thermal and hydraulic performance. As it is difficult to measure the surface wettability in a mini/microchannel, this work makes use of the ageing and surface characterization study conducted on the dummy copper samples to infer the influence of ageing on mini/microchannel surface characteristics and consequently its boiling performance. The test involves measuring over a period of time the wetting behaviors of the end-milled copper samples left in water at three different conditions: one in a constant temperature bath maintained at 60 °C and 1 atm and the remaining two in a pool of boiling water at 110 °C and 120 °C. The study compares the fresh sample and the aged sample for the surface oxidation, surface chemical composition and surface morphology, and discusses the changes in the contact angle and surface morphology caused by copper ageing.
7 citations
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TL;DR: In this article, the authors provide the information about experimental and numerical studies that has been done on the heat transfer and its enhancement in micro-scale cooling devices. But, they mainly concentrate on heat transfer enhancement techniques in microchannel, numerical methods that has also been implemented for the study of micro-channels and the parameters which effects heat transfer rate.
Abstract: Miniaturization of the energy systems and high powered electronic devices necessitates the high capacity compact heat exchangers to dissipate the heat generated. Microchannel heatsinks (MCHS) are modern heat exchangers with the fluid flowing channels of size in microscale. These are very compact heat exchangers with higher ratios of heat transfer area to the volume. Huge research work has been going on to improve the hydraulic and thermal performance of the MCHS. This article provides the information about experimental and numerical studies that has been done on the heat transfer and its enhancement in micro-scale cooling devices. This review mainly concentrate on the heat transfer enhancement techniques in microchannel, numerical methods that has been implemented for the study of micro-channels and the parameters which effects the heat transfer rate. The recent studies on microchannel heat sink to improve its performance by geometry modifications, jet impingement, using Nano fluids, flow boiling and Magneto-hydrodynamics are thoroughly discussed in this article.
61 citations
TL;DR: In this article, a 20-L spherical closed explosion experimental system and spectral measurement system are used to investigate the pressure and flame emission spectra characteristics of the intermediate products during the mixed explosion process of five typical gases (CH4, C2H6, C 2H4, CO, and H2).
42 citations
TL;DR: The test results indicate that using the most important parameters rather than all available parameters is able to formulate a reasonable ANN model, and reveals that the developed ANN model can be transferred in a different dataset from the same domains but shows an unacceptable performance for different domains.
37 citations
TL;DR: In this paper, a novel interlaced microchannel is designed, and two side walls of the microchannel are served as the main heat transfer surface, and the thermal and hydraulic performance of the inter-laced and parallel microchannels are numerically investigated using the full-size conjugate heat transfer model, and then are compared with the experimental results.
24 citations
TL;DR: In this paper, a novel scheme for studying the effect of microstructure surface roughness on sub-cooled flow boiling is developed, and the results of this newly developed scheme are compared with the traditional method and a smooth surface.
21 citations