TY  - JOUR
Y1  - 2014///
A1  - Nordin, N.
A1  - Abdul Karim, Z.A.
A1  - Othman, S.
A1  - Raghavan, V.R.
JF  - Applied Mechanics and Materials
UR  - https://www.scopus.com/inward/record.uri?eid=2-s2.0-84891959750&doi=10.4028%2fwww.scientific.net%2fAMM.465-466.597&partnerID=40&md5=7e27decf300bfb99f738b73df2fe31e2
VL  - 465-46
CY  - Bangi-Putrajaya
N2  - A turning diffuser is often introduced in the flow line to recover the energy losses by converting the kinetic energy to pressure energy. There are two types of turning diffusers, i.e. a 2-D and 3-D diffuser that are commonly defined by their expansion direction. This study aims to investigate the performance of a 2-D and a 3-D turning diffuser with 90° angle of turn and an area ratio, AR=2.16 by means of varying operating conditions. The geometry configurations applied for a 2-D turning diffuser are outlet-inlet configurations, W2/W12-D=2.160, X2/X12-D =1.000 and an inner wall length to an inlet throat width ratio, Lin/W12-D=4.370, whereas for a 3-D turning diffuser, they are W2/W13-D=1.440, X2/X13-D =1.500 and Lin/W13-D=3.970. The operating conditions represented by inflow Reynolds numbers, Rein are varied from 5.786E+04 to 1.775E+05. Particle image velocimetry (PIV) is used to examine the flow quality, and a digital manometer provides the average static pressure at the inlet and outlet of the turning diffuser. A compromise between the maximum permissible pressure recovery and flow uniformity is determined based upon the need. Whenever the flow uniformity being the need it is promising to apply a 3-D turning diffuser for Rein=1.027E+05 - 1.775E+05 and a 2-D turning diffuser for Rein=5.786E+04-6.382E+04. On the other hand, it is viable to opt for a 3-D turning diffuser for Rein=5.786E+04-6.382E+04 and a 2-D turning diffuser for Rein=1.027E+05-1.775E+05 in the case of the outlet pressure recovery being the need. The secondary flow separation takes place prior at 1/2Lin/W1 for a 2-D turning diffuser, whereas approximately at 3/4Lin/W1 for a 3-D turning diffuser. © (2014) Trans Tech Publications, Switzerland.
ID  - scholars4415
KW  - Digital manometers; Flow uniformity; Inlet conditions; Operating condition; Outlet pressures; Particle image velocimetries; Pressure energies; Pressure recovery
KW  -  Energy dissipation; Flow visualization; Industrial engineering; Intake systems; Kinetics; Recovery; Reynolds number; Velocimeters; Velocity measurement
KW  -  Inlet flow
SN  - 16609336
EP  - 602
AV  - none
N1  - cited By 10; Conference of 4th International Conference on Mechanical and Manufacturing Engineering, ICME 2013 ; Conference Date: 17 December 2013 Through 18 December 2013; Conference Code:101955
TI  - The performance of turning diffusers at various inlet conditions
SP  - 597
ER  -