The phrase "a combination of tubes" is correct and usable in written English.
It can be used when describing an assembly or arrangement that includes multiple tubes, often in a scientific or technical context.
Example: "The experiment required a combination of tubes to effectively mix the different chemical solutions."
Alternatives: "a set of tubes" or "an assembly of tubes".
The failure mechanism was controlled by the tensile strain in the steel tube and it was caused by a combination of tube local buckling and tube fracture.
One of the structures utilized vertical plates with access holes between sections (called the UC) while the other was a combination of tube and plate sections (called the TC).
"Condition" (Table 1) was a combination of tube plastic (low-retention and standard) and solution (tissue culture water, stabilising solution, and carrier DNA).
Special note: Some amps use a combination of Tube and Solid-State technology.
One possibility is a combination of photomultiplier tubes (PMTs) and plastic scintillators.
The "concentrator augmented solar collector array" being a combination of evacuated tube heat pipes with either an external or internal concentrator having a heat pipe or direct flow absorber as the last tube of the array.
The effect of molecular hydrogen on the formation of molecular carbonaceous species important for soot formation is studied through a combination of shock-tube experiments with high-repetition-rate time-of-flight mass spectrometry and detailed chemistry modeling.
This study investigates how oil type and water presence can affect the ISC performance, based on using a combination of combustion tube and Thermogravimetric Analysis and Differential Scanning Calorimetry (TGA/DSC) experiments.
In this paper, the performance of a novel HDH solar desalination system equipped with a combination of heat pipe (HP), evacuated tube collector (ETC) and air bubble column humidifier is experimentally investigated.
The existing design rules for TO failure were examined by comparing their strength predictions with the test results from the welded connections in VHS tubes, previous test results from connections in SSHS and a combination of welded VHS tubes and SSHS.
