نتایج جستجو برای: grooved tube

تعداد نتایج: 97630  

2014
Sangmu Lee Akira Ishibashi Takuya Matsuda Sangmu LEE Akira ISHIBASHI Takuya MATSUDA

A plate-fin heat exchanger is a type of heat exchanger widely used in air conditioners, and tubes and fins are tightly assembled by the mechanical expansion process of tubes. The tube expansion process deforms the grooves inside the tube, and the groove shapes also affect the adhesion between tubes and fins. In this study, the adhesion and heat transfer performance affected by the tube expansio...

Introduction: In the present experimental investigation, the thermal and electrical performances of a photovoltaic/thermal system equipped with a sheet-and-grooved serpentine tube collector are investigated. The water-magnetite nanofluid is used as the heat transfer fluid. The effect of nanoparticle volume concentration (0-1%), nanofluid mass flow rate (10-40 kg/h) and groove pitch (0, 0.54 an...

Journal: :journal of heat and mass transfer research(jhmtr) 2015
komayl mohebbi roohollah rafee farhad talebi

the forced convection heat transfer of turbulent al2o3-water nanofluid flow inside the grooved tubeswith the different aspect ratio of the rectangular grooves is numerically investigated. the governingequations have been solved using finite volume method (fvm) coupled with simple algorithm. it isassumed the heat flux is constant on the grooved walls. the single-phase approach is applied for the...

2014
M. Uchida N. Shikazono M. Kudoh

In the present study, the condensation and evaporation heat transfer performance of a zeotropic refrigerant mixture (HFC32/HFC125/HFC134a) inside horizontal tubes with smooth, grooved or cross·grooved inner surfaces was investigated experimentally. The cross-gTOoved tube showed the highest heat transfer coefficient for both condensation and evaporation with the zeotropic mixture. Its heat trans...

Journal: :International Journal of Agricultural and Biological Engineering 2023

The metering device is the central part of seeder discharging granular fertilizers or seeds from hopper to colter passing through tube. Depending on design, batches particles are discharged evenly. This research analyzes existing devices, and a new pin-roller recommended discharge evenly high doses wheat at low rotation speeds. objective was adapt precision agriculture so that little electric m...

The main objective of this research is to improvethe design and performance of the polyurethane foam-filled thin-walled aluminum grooved circular tubes using multi-response optimization (MRO) technique. The tubes are shaped with the inner and the outer circular grooves at different positions along the axis. For this aim, several numerical simulations using ABAQUS finite element explicit code ar...

2016
Avram Bar-Cohen Darin James Sharar

Title of Document: FLOW REGIME DRIVEN THERMAL ENHANCEMENT IN INTERNALLY-GROOVED TUBES Darin Sharar, Doctor of Philosophy, 2016. Directed by: Professor Avram Bar-Cohen Department of Mechanical Engineering Internally-grooved refrigeration tubes maximize tube-side evaporative heat transfer rates and have been identified as a most promising technology for integration into compact cold plates. Unfor...

1994
Lei-Han Tang Yu Tang

Liquid in grooved capillaries, made by e-ginserting a plate in a cylindrical tube, exhibits unusual spreading and flow properties. One example is capillary rise, where a long, upward tongue on top of the usual meniscus has been observed along the groove. We attribute the underlying mechanism to a thermodynamic instability against spreading for a (partial

Journal: :Korean Journal of Air-Conditioning and Refrigeration Engineering 2012

Journal: :Journal of the Japan Society for Technology of Plasticity 2008

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