Final answer:
The T-shape crosspiece on top of chimney pipes helps draw up gases due to Bernoulli's principle. There is no specific limit to the height an entrainment device can raise a fluid, but practical limitations and safety considerations exist.
Step-by-step explanation:
In terms of Bernoulli's principle, the T-shape crosspiece on top of some chimney pipes helps draw up gases whenever there is even a slight breeze. According to Bernoulli's principle, as the speed of a fluid (in this case, the gases) increases, its pressure decreases. So, when the wind blows over the top of the chimney, it creates a low-pressure area, causing the gases inside to be drawn up and expelled from the chimney.
There is no specific limit to the height to which an entrainment device can raise a fluid. However, there are practical limitations to consider. As the height of the chimney increases, the pressure difference between the bottom and top of the chimney decreases, and this can reduce the effectiveness of the entrainment device. Additionally, there may be structural limitations and safety considerations that restrict the height of a chimney.