gep20129borito9/2012

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•  9/2012 table of contents

A TANSZÉK TÖRTÉNETE    3

Szilágyi G.:
NEW DUAL-FUNCTION DYNAMIC TEST CELL AT MISKOLC UNIVERSITY   5

Baranyi L.:
EFFECT OF INITIAL CONDITIONS ON FLOW PAST AN OSCILLATING CYLINDER   7
This numerical investigation concentrates on the effect of initial condition on the low-Reynolds-number flow past a circular cylinder oscillating in either in-line or transverse directions or following an elliptical path.

Baranyi L., Daróczy L.:
FLOW PARAMETER EFFECTS ON ENERGY TRANSFER BETWEEN AN OSCILLATING CYLINDER AND FLUID   13
Mechanical energy transfer is investigated numerically in a 3D parameter phase space of low Reynolds numbers, transverse oscillation amplitude and frequency ratio within the lock-in domain to identify potential VIV risks.

Daróczy L., Baranyi L.:
FIRST- AND SECOND-ORDER TEMPORAL DISCRETIZATION FOR COMPUTATION OF FLOW AROUND A CIRCULAR CYLINDER   17
This numerical study compares 1st order Euler and 2nd order Runge-Kutta temporal discretization schemes for low Reynolds number fl ow around a stationary cylinder. CUP and GPGPU solvers were also compared.

Bencs P., Szabó S., Bordás R., Thévenin D., Zähringer K.:
INFLUENCE OF BACKGROUND PATTERN ON THE TEMPERATURE FIELD MEASURED BY BACKGROUND ORIENTED SCHLIEREN   21
The present contribution considers the effect of different background structures on the resulting temperature fi eld. The objective of this work is to fi nd the optimal dot density for the background pattern used in BOS measurements.

Bolló B.:
IN-LINE OSCILLATORY FLOW AROUND A HEATED CIRCULAR CYLINDER   25
A heated circular cylinder is placed in in-line oscillatory fl ow. Effects of temperature and oscillation amplitude on force coeffi cients, heat transfer, and mechanical energy transfer are investigated numerically.

Hajdú S., Czibere T., Kalmár L.:
INTAKE FLOW PATTERN ANALYSIS OF A BANKI TURBINE BASED ON POTENTIAL THEORY   29
The paper provides some basic information on the Banki turbine, as well as on the fi rst results of a potential theory based fl ow pattern analysis which aims to investigate the streamlines in the intake section of a Banki turbine.

Fodor B., Nagy J.:
ENERGETIC ANALYSIS OF A REFRIGERATOR CONDENSER   33
The variation in condenser temperature range is investigated experimentally, using a thermocamera on 160-litre energy-effi cient refrigerators. Temperature is measured on the wire of the condenser.

Janiga G., Arányi P., Kalmár L.:
STRUCTURED MESHES FOR NUMERICAL SIMULATION   37
This paper gives an overview of the differences between unstructured and block-structured computational meshes for computational fl uid dynamics. Several examples are also given.

Varga Z., Kalmár L., Hellmann R.:
NUMERICAL ANALYSIS OF THE HEAT TRANSPORT PROCESS IN A UV LED MODULE   41
The paper deals with the CFD analysis and experimental investigation of heat transfer caused by a high-powered LED in a UV LED module. The computational and experimental results are compared.

Varga Z., Kalmár L., Jármai K.:
NUMERICAL OPTIMIZATION OF A 3x3 UV LED MODULE   45
The paper describes the optimization of a UV LED module from heat engineering point of view. CFD simulation of the module is coupled with different numerical optimization methods.

Tugyi D., Kalmár L., Csikós M.:
NUMERICAL SIMULATION OF A WATER SUPPLY SYSTEM USING AQUIS   49
The paper deals with the numerical analysis of a complex water supply system using commercial software package AQUIS. The package is used to build the model and to determine the operational parameters of the system.

Szaszák N., Mátrai Zs., Szabó Sz.:
VELOCITY DISTRIBUTION CONTROL IN A SMALLSCALE WIND TUNNEL USING FLOW GUIDES   53
The aim of the study is to ensure the proper velocity distribution by several compilations of fl ow guides in a small-scale wind tunnel using constant temperature anonometry. The wind tunnel will be used in active-grid experiments.

Tollár S., Mátrai Zs.:
EFFECT OF FUEL CHARACTERISTICS ON OPERATING PARAMETERS OF A ONE-CYLINDER DIESEL ENGINE   57
The paper investigates the effects of three kinds of diesel fuels on the operating parameters of a one-cylinder diesel engine. Signifi cant differences are found in the emission rates but the fuel consumptions are roughly identical.

Handki A., Tolvaj B.:
NUMERICAL ANALYSIS OF STIRLING REFRIGERATOR   61
In this paper a method is presented for the determination of the main characteristics of the thermodynamic processes in the workspace and regenerator of a Stirling machine assuming one-dimensional, non-isentropic, unsteady flow.

Nagy J., Tolvaj B.:
TRANSIENT FLOW THROUGH CAPILLARY TUBES   65
This work presents a numerical model to simulate unsteady refrigerant fl ow through capillary tubes. The system of governing equations is solved using the method of characteristics.

Nagy J., Tolvaj B.:
ENERGY CONSUMPTION OF REFRIGERATORS   69
The paper analyzes the energy consumption of refrigerators. The effects of two different arrangements of the evaporator and the condenser are predicted using thermodynamic principles.

JUBILEUMI SZAKMAI KONFERENCIA   73

KÖNYVISMERTETŐ   74

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