Mladen Bošnjaković

11 Questions 91 Answers 0 Followers

Questions related from Mladen Bošnjaković

Heat transfer coefficient on shell side of shell and tube HE?

Hot water enters on the shell side and cools along the tubes. Why does the heat transfer coefficient decrease along the tubes and have a lower value at the water outlet? And why does the heat...

18 October 2022 3,592 4 View

Where have be found good examples of Performance evalutions criteria (PEC) for Heat exchanger with cicrular finned tubes?

One good literature source is R. L. Webb. Principles of Enhanced Heat Transfer, Taylor & Francis, 2005. If there are more good sources to recommend? What criteria are most applicable in practice?

05 March 2017 6,114 5 View

How to set correct Convergence Tolerance?

I am solving heat finned tube heat exchanger. At Residual monitor is default setings for Convergence Tolerance. All values is set to 0,001 exep energy to 1e-06. If velocity of air at input is 2...

01 February 2017 1,136 9 View

Does Inflating layers need to be on both sides: on fluid and solid body?

Object of interest is fluid flow over tube in heat exchanger. Does Inflating layers need to be on both sides: on fluid side (air) and solid body (tube)? If yes, thus number of layer have to be...

15 January 2017 1,240 5 View

Reversibile flow on outlet in ansys Fluent?

I make calculation of my model of finned heat exchangers by Ansys Fluent. Model is somewhat complicated and have abut 5 millions elements and 8 inflation's layers. I chose k-epsilon method for...

01 January 1970 3,825 12 View

How to import correct model for ANSYS FLUENT?

I made a model of the heat exchanger in SolidWorks. The goal is to make numerical simulation using ANSYS FLUENT (ver 15.0). So far I have not used the said program is likely to be adapted designed...

01 January 1970 1,707 3 View

Is the situation with COVID-19 changed your opinion regarding the e-studying?

In many countries, gatherings of people are prohibited. Colleges and many other institutions do not operate in the usual mode but in a special one where most of the activities are done from...

01 January 1970 8,090 16 View

How to define the air properties in the heat exchanger calculation: as constant or temperature dependent?

I calculate Heat exchanger air-water, the air is heated. The air at the entrance is about 20 C. Ansys offers the ability to define air properties (density, thermal conductivity, dynamic viscosity...

01 January 1970 1,029 2 View

How to calculate hydraulic diameter (for finned heat exchanger)-debate?

Hydraulic diameter - dh - is the "characteristic length" used to calculate the dimensionless Reynolds Number and Nu number. Therefore it is vital for evalution of different types of heat...

01 January 1970 4,114 4 View

How to solve divergence problem?

I am trying to solve my model of heat exchanger with finned tubes in Fluent. First variant with air velocity of 1 m/s converged after cca 550 iteration in k-epsilon model. Now I choose velocity of...

01 January 1970 9,523 17 View

How many visual identity of an institution affects attracting students to study at that institution?

Students choose faculty based on multiple factors: their desires, financial opportunities, employment opportunities after studying, colleagues 'recommendations, parents' wishes and so on. The...

01 January 1970 9,780 0 View