Numerical analysis of flow and heat transfer enhancement in a horizontal pipe with P-TT and V-Cut twisted tape

An experimental analysis has been carried out for heat transfer and turbulent flow in a heat exchanger circular tube with solid ring with combined square wing twisted tape (TT) inserts. Experimenta...

Development of new correlations for heat transfer and friction loss of solid ring with combined square wing twisted tape inserts heat exchanger tube

In
microalgae based biofuel technology, the light is one of the important factors
for the proper growth of microalgae cells as microalgae is a photosynthetic
microorganism. For a large scale outdoor culture the irradiance of sunlight and
associated temperature is also need to consider. In this study aims to present
computational model of microalgae growth taking effect of solar irradiance and
corresponding temperature in a tubular photo bioreactor for an outdoor culture
system. We consider the transient behavior of temperature inside the photo
bioreactor for a microalgae culture. The optimum range of temperature for
outdoor cultivation of microalgae is about 22℃ - 27℃ and out of this range the microalgae cell
growth inhibits. Many correlations have already been established to investigate
the algal productivity based on the dynamic conditions of temperature in case
of full scale outdoor cultivation. However, none of them are validated yet
numerically considering the model as a function of weather conditions,
operational behavior and design criteria. A tubular photobioreactor (PBR) with
length 20.5 m and radius 0.05 m has taken account as a simulation model. The PBR is horizontally placed
as temperature variations can be observed with greater accuracy. As the solar
irradiance varies at any geographic latitude for a year and so thus
temperature, equations and parameters are established relating the irradiance
with the temperature to simulate the effect. We observed some significant
effects of temperature on the growth of microalgae. Moreover, for the maximum
growth of the cells we should control the surrounding temperature.

/pdf/the-effect-of-irradiance-related-temperature-on-microalgae-2p5pporeyi.pdf

The Effect of Irradiance Related Temperature on Microalgae Growth in a Tubular Photo Bioreactor for Cleaner Energy

The influence of serrated circular rings with rectangular winglets (SCRWRW) on the thermal performance of circular tube heat exchanger has been studied experimentally and computationally. The geome...

Effects of serrated circular ring with rectangular winglets on thermal properties of tube heat exchanger: an experimental and numerical study

The aim of the present study is to numerically investigate the thermal performance of a heat exchanger tube fitted with vortex generator inserts. In the present paper, three configurations of vorte...

Thermal Performance Enhancement for Heat Exchanger Tube Fitted with Vortex Generator Inserts

The Enhancement of Heat Transfer in a Circular Tube with Insert and without Insert by Using the Finite Element Method

Microalgae based biofuel is now an emerging source of renewable energy alternative to the fossil fuel. This paper aims to present computational model of microalgae culture taking effect of solar irradiance and corresponding temperature in a photo bioreactor (PBR). As microalgae is a photosynthetic microorganism, so irradiance of sunlight is one of the important limiting factors for the proper growth of microalgae cells as temperature is associated with it. We consider the transient behaviour of temperature inside the photo bioreactor for a microalgae culture. The optimum range of temperature for outdoor cultivation of microalgae is about 16-35°c and out of this range the cell growth inhibits. Many correlations have already been established to investigate the heat transfer phenomena inside a tubular PBR. However, none of them are validated yet numerically by using a user defined function in a simulated model. A horizontal tubular PBR length 20.5m with radius 0.05m has taken account to investigate the temperature effect for the growth of microalgae cell. As the solar irradiance varies at any geographic latitude for a year so an empirical relation is established between local solar irradiance and temperature to simulate the effect. From our simulation, we observed that the growth of microalgae has a significant effect of temperature and the solar irradiance of our locality is suitable for the culture of microalgae.

Kazi Afzalur Rahman

Papers

The Enhancement of Heat Transfer in a Circular Tube with Insert and without Insert by Using the Finite Element Method

Simulation of temperature effect on microalgae culture in a tubular photo bioreactor for local solar irradiance