Loading...
Search for:
laboratory-datum
0.005 seconds
An applicable method for efficiency estimation of operating tray distillation columns and its comparison with the methods utilized in HYSYS and Aspen Plus
, Article Heat and Mass Transfer/Waerme- und Stoffuebertragung ; Volume 51, Issue 10 , October , 2015 , Pages 1393-1402 ; 09477411 (ISSN) ; Sharif University of Technology
Springer Verlag
2015
Abstract
Developing general methods that rely on column data for the efficiency estimation of operating (existing) distillation columns has been overlooked in the literature. Most of the available methods are based on empirical mass transfer and hydraulic relations correlated to laboratory data. Therefore, these methods may not be sufficiently accurate when applied to industrial columns. In this paper, an applicable and accurate method was developed for the efficiency estimation of distillation columns filled with trays. This method can calculate efficiency as well as mass and heat transfer coefficients without using any empirical mass transfer or hydraulic correlations and without the need to...
Prognostic of rolling element bearings based on early-stage developing faults
, Article International Journal of COMADEM ; Volume 23, Issue 1 , February , 2020 , Pages 55-60 ; Behzad, M ; Ghodrati, B ; Khodaygan, S
COMADEM International
2020
Abstract
Rolling-element bearing (REB) failure is one of the general damages in rotating machinery. In this manner, the correct prediction of remaining useful life (RUL) of REB is a crucial challenge to move forward the unwavering quality of the machines. One of the main difficulties in implementing data-driven methods for RUL prediction is to choose proper features that represent real damage progression. In this article, by using the outcomes of frequency analysis through the Envelope method, the initiated/existed defects on the ball bearings are identified. Also, new features based on developing faults of ball bearings is recommended to estimate RUL. Early-stage faults in ball bearings usually...
Simultaneous determination of gas–water relative permeability and capillary pressure from steady-state corefloods
, Article Journal of Hydrology ; Volume 598 , 2021 ; 00221694 (ISSN) ; Hemmati, N ; Behr, A ; Genolet, L ; Mahani, H ; Zeinijahromi, A ; Bedrikovetsky, P ; Sharif University of Technology
Elsevier B.V
2021
Abstract
For traditional calculations of relative phase permeability (Kr) from coreflood Steady-State Test (SST), the capillary pressure (Pc) is required. Usually, Pc is determined from a separate test, using a centrifuge or porous-plate methods. However, during SSTs, water cut and pressure drop are measured during the transition period between two sequential fractional-flow steps. We developed a novel method for simultaneous determination of Kr and Pc from SST by using both steady-state and transient data. In the proposed method, the transition data on the pressure drop across the core are used instead of the traditionally utilised Pc-curve. The main idea is that the stabilisation period during each...