A Theoretical and Experimental Investigation of Heat Transfer in a Two-phase Thermosiphon PDF Download
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Author: Mary Joan Egan
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Mary Joan Egan
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Philip A. Jallouk
Publisher:
ISBN:
Category :
Languages : en
Pages : 310
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Author: Nicholas P. Cheremisinoff
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 216
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Author: Artur J. Jaworski
Publisher: MDPI
ISBN: 3039214276
Category : Technology & Engineering
Languages : en
Pages : 460
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Book Description
Fluid flow and heat transfer processes play an important role in many areas of science and engineering, from the planetary scale (e.g., influencing weather and climate) to the microscopic scales of enhancing heat transfer by the use of nanofluids; understood in the broadest possible sense, they also underpin the performance of many energy systems. This topical Special Issue of Energies is dedicated to the recent advances in this very broad field. This book will be of interest to readers not only in the fields of mechanical, aerospace, chemical, process and petroleum, energy, earth, civil ,and flow instrumentation engineering but, equally, biological and medical sciences, as well as physics and mathematics; that is, anywhere that “fluid flow and heat transfer” phenomena may play an important role or be a subject of worthy research pursuits.
Author:
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ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 276
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Author: Sara A Kloczko
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages :
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A Non-phase change heat pipe (NPCHP) with no wick was proposed recently as a new heat pipe which is not dependent on a wick or phase change at steady state operation and where the heat transfer is driven by the pressure response to a heat input, rather than phase change. The NPCHP is not a new device as suggested but is a loop thermosyphon with very high fill ratio. This effort focuses on proving the NPCHP, as an overfilled loop thermosyphon, is an effective heat transfer device through experiments and numerical simulations. An analysis of the operation and effectiveness of the thermosyphon is performed through both experimentation and numerical simulation. The loop thermosyphon is shown to have a high effective thermal conductivity when tested with water and R134a as working fluids in several fill ratios and heat inputs greater than 200W, a fast thermal response time, and a high heat flux on the order of 105 W/m2. NPCHP exhibits characteristics of a loop thermosyphon and can be classified as such. This effort also focuses on understanding how changing different system parameters, including heat inputs of 100-350W, fill ratios of 25-100% for water and R314a as working fluids, and inclination angles of with the evaporator vertically below the condenser, at a 45o angle with the evaporator below the condenser, horizontal, and vertical with the evaporator above the condenser, affect the overall system performance of the loop thermosyphon. A detailed experimental investigation including flow visualization is performed. Depending on the initial fill ratio and working fluid, the loop thermosyphon is shown to either operate as a two-phase loop thermosyphon (TPLTS) or a single-phase loop thermosyphon (SPLTS). Finally, a detailed 2D computational fluid dynamics (CFD) model simulating two-phase flow and heat transfer in a TPLTS is presented. The CFD simulation was built to represent two-phase flow and heat transfer phenomena during the transient analysis of a TPLTS under various operating conditions. The two-phase flow was modeled using the volume of fluid (VOF) model, and the Lee model was utilized for evaporation and condensation. Simulation results were compared with experimental temperature, pressure, and flow visualization data.
Author: James R. Stone
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 42
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Author: Frank Anthony Stauder
Publisher:
ISBN:
Category :
Languages : en
Pages : 436
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Author: Richard Steven Tucker
Publisher:
ISBN:
Category : Mechanical engineering
Languages : en
Pages : 0
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A rotating two-phase thermosyphon fitted with a copper condenser section was tested at 700, 1400 and 2800 RPM using water, ethanol and freon 113 as working fluids. Both experimental and theoretical heat transfer rates were determined. Agreement between theory and experiment was good at low rotational speeds and improved as the rotational speed increased. (Modified author abstract).
Author: Nicholas Paul Cheremisinoff
Publisher:
ISBN:
Category : Two-phase flow
Languages : en
Pages : 416
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