A novel multiple-airlifting membrane bioreactor is built with four sintered stainless steel tubular filters as the risers and downcomers. This work investigates the hydrodynamics including gas holdup, liquid velocity, liquid circulation and mixing times by aerating different number of risers (one to three) at superficial gas velocities of 0.02–0.07m/s The mass transfer phenomena, including oxyg...

Large-scale cultivation is an essential step towards the feasible production of baculovirus in insect cell cultures. Airlift reactors appear to offer considerable advantages over other insect cell culture systems. In order to evaluate the impact of reactor design on the behavior of insect cell cultures, the IPLB-Sf-21 cell line was cultivated in three different concentric tube airlift reactors ...

A measurement device for sieve plates have been designed and built at Helsinki University of Technology. The unit consists of a rectangular transparent container where one plate is installed. The flow path on the plate is of constant width. The plate is easy to change and sieve plates with two different diameters of holes have already been measured. The measurements have been done with two syst...

Two-phase thermosyphon loops (TPTLs) are widely used in air-conditioning field for heat recovery and free cooling utilization in recent years. The height difference between the condenser and the evaporator is always considered as the driven force of thermosyphon. However, experiments show the cooling capacity of the TPTLs is not linearly improved with the increase of the height difference. So, ...

NEPTUNE_CFD is a code based on a 3D transient Eulerian two-fluid model. One of the main application targets is the two-phase Pressurized Thermal Shock (PTS), which is related to PWR Reactor Pressure Vessel (RPV) lifetime safety studies, when sub-cooled water from Emergency Core Cooling (ECC) system is injected into the possibly uncovered cold leg and penetrates into the RPV downcomer. Five expe...

The slow development of microalgal biotechnology is due to the failure in the design of large-scale photobioreactors (PBRs) where light energy is efficiently utilized. In this work, both the quality and the amount of light reaching a given point of the PBR were determined and correlated with cell density, light path length, and PBR geometry. This was made for two different geometries of the dow...

Abstract— PT. PLTU Indonesia di Pelabuhan Ratu Sukabumi memiliki boiler yang terdiri dari economizer, steam drum, downcomer, coal worker, wall stirrer, superheater, heater dan valve terhubung ke sistem. Salah satu sistem akan diservis adalah drum level. Level uap tidak boleh mencapai level terendah (LLL). Pada tanggal 15 Mei 2019 terjadi kebocoran water tepatnya blok 1 pipa dinding air belakang...

A porous debris bed formed after a severe accident is structure composed of different sized particles. Due to the fission reaction in bed, decay heat continuously released. Therefore, cooling ability should be investigated determine safety bed. In this paper, two-phase conservation equations with closure correlations are proposed for boiling phenomenon inside pool. For flow resistance, drag for...